{
  "title": "Measuring Angles Intro - Grade 4",
  "total_questions": 86,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What tool do we use to measure angles?", "options": {"A": "Ruler", "B": "Protractor", "C": "Compass", "D": "Calculator"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "How many degrees are in a right angle?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "What is the name of an angle that measures less than 90°?", "options": {"A": "Right angle", "B": "Obtuse angle", "C": "Acute angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "How many degrees are in a straight angle?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "C"},
    {"id": 5, "difficulty": "easy", "question": "What is the name of an angle that measures more than 90° but less than 180°?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 6, "difficulty": "easy", "question": "How many degrees are in a full circle?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "D"},
    {"id": 7, "difficulty": "easy", "question": "What is the name of an angle that measures exactly 90°?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "B"},
    {"id": 8, "difficulty": "easy", "question": "How many degrees are in a quarter turn?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "B"},
    {"id": 9, "difficulty": "easy", "question": "What is the name of an angle that measures exactly 180°?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "D"},
    {"id": 10, "difficulty": "easy", "question": "How many degrees are in a half turn?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "What is the name of an angle that measures more than 180° but less than 360°?", "options": {"A": "Reflex angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "A"},
    {"id": 12, "difficulty": "easy", "question": "How many degrees are in a three-quarter turn?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "C"},
    {"id": 13, "difficulty": "easy", "question": "What is the name of an angle that measures exactly 360°?", "options": {"A": "Full angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "How many degrees are in a complete turn?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "D"},
    {"id": 15, "difficulty": "easy", "question": "What is the name of an angle that measures exactly 45°?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "A"},
    {"id": 16, "difficulty": "easy", "question": "How many degrees are in a right angle?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "B"},
    {"id": 17, "difficulty": "easy", "question": "What is the name of an angle that measures exactly 135°?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 18, "difficulty": "easy", "question": "How many degrees are in a straight angle?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "What is the name of an angle that measures exactly 30°?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "A"},
    {"id": 20, "difficulty": "easy", "question": "How many degrees are in a full circle?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "D"},
    {"id": 21, "difficulty": "medium", "question": "If an angle measures 75°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "A"},
    {"id": 22, "difficulty": "medium", "question": "What is the measure of an angle that is half of a right angle?", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "If an angle measures 120°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "What is the measure of an angle that is one-third of a straight angle?", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "C"},
    {"id": 25, "difficulty": "medium", "question": "If an angle measures 150°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 26, "difficulty": "medium", "question": "What is the measure of an angle that is two-thirds of a right angle?", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "C"},
    {"id": 27, "difficulty": "medium", "question": "If an angle measures 200°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "What is the measure of an angle that is one-quarter of a full circle?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "270°"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "If an angle measures 300°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 30, "difficulty": "medium", "question": "What is the measure of an angle that is three-quarters of a full circle?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "C"},
    {"id": 31, "difficulty": "medium", "question": "If an angle measures 85°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "A"},
    {"id": 32, "difficulty": "medium", "question": "What is the measure of an angle that is half of a straight angle?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "If an angle measures 100°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "What is the measure of an angle that is one-sixth of a full circle?", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "C"},
    {"id": 35, "difficulty": "medium", "question": "If an angle measures 250°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "What is the measure of an angle that is one-eighth of a full circle?", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "If an angle measures 95°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 38, "difficulty": "medium", "question": "What is the measure of an angle that is two-thirds of a straight angle?", "options": {"A": "60°", "B": "90°", "C": "120°", "D": "180°"}, "correct_answer": "C"},
    {"id": 39, "difficulty": "medium", "question": "If an angle measures 350°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "What is the measure of an angle that is one-tenth of a full circle?", "options": {"A": "18°", "B": "36°", "C": "54°", "D": "72°"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "If an angle measures 110°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "What is the measure of an angle that is one-fifth of a full circle?", "options": {"A": "36°", "B": "45°", "C": "60°", "D": "72°"}, "correct_answer": "D"},
    {"id": 43, "difficulty": "medium", "question": "If an angle measures 280°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "medium", "question": "What is the measure of an angle that is one-third of a right angle?", "options": {"A": "15°", "B": "30°", "C": "45°", "D": "60°"}, "correct_answer": "B"},
    {"id": 45, "difficulty": "medium", "question": "If an angle measures 170°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 46, "difficulty": "medium", "question": "What is the measure of an angle that is one-half of a straight angle?", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "medium", "question": "If an angle measures 320°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 48, "difficulty": "medium", "question": "What is the measure of an angle that is one-quarter of a straight angle?", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "B"},
    {"id": 49, "difficulty": "medium", "question": "If an angle measures 140°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 50, "difficulty": "medium", "question": "What is the measure of an angle that is one-sixth of a straight angle?", "options": {"A": "15°", "B": "30°", "C": "45°", "D": "60°"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "If an angle measures 240°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "medium", "question": "What is the measure of an angle that is one-eighth of a straight angle?", "options": {"A": "15°", "B": "22.5°", "C": "30°", "D": "45°"}, "correct_answer": "B"},
    {"id": 53, "difficulty": "medium", "question": "If an angle measures 130°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 54, "difficulty": "medium", "question": "What is the measure of an angle that is one-third of a full circle?", "options": {"A": "60°", "B": "90°", "C": "120°", "D": "180°"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "medium", "question": "If an angle measures 290°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 56, "difficulty": "medium", "question": "What is the measure of an angle that is one-fifth of a straight angle?", "options": {"A": "18°", "B": "36°", "C": "54°", "D": "72°"}, "correct_answer": "B"},
    {"id": 57, "difficulty": "medium", "question": "If an angle measures 160°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Right angle", "C": "Obtuse angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 58, "difficulty": "medium", "question": "What is the measure of an angle that is one-tenth of a straight angle?", "options": {"A": "9°", "B": "18°", "C": "27°", "D": "36°"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "medium", "question": "If an angle measures 270°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "medium", "question": "What is the measure of an angle that is one-twelfth of a full circle?", "options": {"A": "15°", "B": "30°", "C": "45°", "D": "60°"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "hard", "question": "If an angle measures 225°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "hard", "question": "What is the measure of an angle that is five-sixths of a right angle?", "options": {"A": "60°", "B": "75°", "C": "90°", "D": "105°"}, "correct_answer": "B"},
    {"id": 63, "difficulty": "hard", "question": "If an angle measures 315°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 64, "difficulty": "hard", "question": "What is the measure of an angle that is seven-eighths of a straight angle?", "options": {"A": "135°", "B": "157.5°", "C": "180°", "D": "202.5°"}, "correct_answer": "B"},
    {"id": 65, "difficulty": "hard", "question": "If an angle measures 340°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 66, "difficulty": "hard", "question": "What is the measure of an angle that is two-fifths of a full circle?", "options": {"A": "72°", "B": "144°", "C": "216°", "D": "288°"}, "correct_answer": "B"},
    {"id": 67, "difficulty": "hard", "question": "If an angle measures 210°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 68, "difficulty": "hard", "question": "What is the measure of an angle that is three-eighths of a full circle?", "options": {"A": "90°", "B": "135°", "C": "180°", "D": "225°"}, "correct_answer": "B"},
    {"id": 69, "difficulty": "hard", "question": "If an angle measures 330°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 70, "difficulty": "hard", "question": "What is the measure of an angle that is five-sixths of a straight angle?", "options": {"A": "120°", "B": "135°", "C": "150°", "D": "165°"}, "correct_answer": "C"},
    {"id": 71, "difficulty": "hard", "question": "If an angle measures 260°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "hard", "question": "What is the measure of an angle that is seven-tenths of a full circle?", "options": {"A": "180°", "B": "216°", "C": "252°", "D": "288°"}, "correct_answer": "C"},
    {"id": 73, "difficulty": "hard", "question": "If an angle measures 350°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 74, "difficulty": "hard", "question": "What is the measure of an angle that is three-fifths of a right angle?", "options": {"A": "36°", "B": "45°", "C": "54°", "D": "60°"}, "correct_answer": "C"},
    {"id": 75, "difficulty": "hard", "question": "If an angle measures 230°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 76, "difficulty": "hard", "question": "What is the measure of an angle that is four-ninths of a full circle?", "options": {"A": "120°", "B": "140°", "C": "160°", "D": "180°"}, "correct_answer": "C"},
    {"id": 77, "difficulty": "hard", "question": "If an angle measures 310°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "hard", "question": "What is the measure of an angle that is five-eighths of a straight angle?", "options": {"A": "90°", "B": "112.5°", "C": "135°", "D": "157.5°"}, "correct_answer": "B"},
    {"id": 79, "difficulty": "hard", "question": "If an angle measures 270°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 80, "difficulty": "hard", "question": "What is the measure of an angle that is seven-twelfths of a full circle?", "options": {"A": "180°", "B": "210°", "C": "240°", "D": "270°"}, "correct_answer": "B"},
    {"id": 81, "difficulty": "hard", "question": "If an angle measures 335°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 82, "difficulty": "hard", "question": "What is the measure of an angle that is two-thirds of a reflex angle of 270°?", "options": {"A": "120°", "B": "150°", "C": "180°", "D": "210°"}, "correct_answer": "C"},
    {"id": 83, "difficulty": "hard", "question": "If an angle measures 245°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 84, "difficulty": "hard", "question": "What is the measure of an angle that is three-sevenths of a full circle?", "options": {"A": "120°", "B": "135°", "C": "154.29°", "D": "165°"}, "correct_answer": "C"},
    {"id": 85, "difficulty": "hard", "question": "If an angle measures 355°, what type of angle is it?", "options": {"A": "Acute angle", "B": "Obtuse angle", "C": "Reflex angle", "D": "Straight angle"}, "correct_answer": "C"},
    {"id": 86, "difficulty": "hard", "question": "What is the measure of an angle that is five-ninths of a straight angle?", "options": {"A": "80°", "B": "90°", "C": "100°", "D": "110°"}, "correct_answer": "C"}
    ]
}