{
  "title": "Area of Triangle (Mensuration) - Grade 5 ICSE",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "What is area of triangle with base=6 cm, height=4 cm? 🔺",
      "options": { "A": "10 cm²", "B": "12 cm²", "C": "14 cm²", "D": "16 cm²" },
      "correct_answer": "B"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "Formula for triangle area is? ✏️",
      "options": {
        "A": "base × height",
        "B": "½ × base × height",
        "C": "side × side",
        "D": "length × width"
      },
      "correct_answer": "B"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "Base=8 cm, height=5 cm. Area=? 📐",
      "options": { "A": "18 cm²", "B": "20 cm²", "C": "22 cm²", "D": "24 cm²" },
      "correct_answer": "B"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "Triangle area is ________ of parallelogram with same base & height. 🔄",
      "options": { "A": "double", "B": "triple", "C": "half", "D": "equal" },
      "correct_answer": "C"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "Find area: base=10 cm, height=7 cm 🧮",
      "options": { "A": "30 cm²", "B": "35 cm²", "C": "40 cm²", "D": "45 cm²" },
      "correct_answer": "B"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "Area = ½ × base × ? ❓",
      "options": { "A": "side", "B": "height", "C": "width", "D": "length" },
      "correct_answer": "B"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "Base=12 m, height=3 m. Area=? 🌳",
      "options": { "A": "16 m²", "B": "18 m²", "C": "20 m²", "D": "22 m²" },
      "correct_answer": "B"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "A triangular flag: base=20 cm, height=15 cm. Area? 🚩",
      "options": {
        "A": "140 cm²",
        "B": "150 cm²",
        "C": "160 cm²",
        "D": "170 cm²"
      },
      "correct_answer": "B"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "If area=24 cm² and base=8 cm, height=? 🔍",
      "options": { "A": "4 cm", "B": "5 cm", "C": "6 cm", "D": "7 cm" },
      "correct_answer": "C"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "Which shape has formula: ½ × base × height? 🤔",
      "options": {
        "A": "Square",
        "B": "Triangle",
        "C": "Rectangle",
        "D": "Circle"
      },
      "correct_answer": "B"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "Base=9 cm, height=6 cm. Area=? 📊",
      "options": { "A": "25 cm²", "B": "27 cm²", "C": "29 cm²", "D": "31 cm²" },
      "correct_answer": "B"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "A triangular piece of cloth: base=30 cm, height=20 cm. Area? 👕",
      "options": {
        "A": "250 cm²",
        "B": "300 cm²",
        "C": "350 cm²",
        "D": "400 cm²"
      },
      "correct_answer": "B"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "Area=40 m², base=10 m. Height=? 📐",
      "options": { "A": "6 m", "B": "7 m", "C": "8 m", "D": "9 m" },
      "correct_answer": "C"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "Base=11 cm, height=8 cm. Calculate area. 🧮",
      "options": { "A": "42 cm²", "B": "44 cm²", "C": "46 cm²", "D": "48 cm²" },
      "correct_answer": "B"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "Which measurement NOT in triangle area formula? ❌",
      "options": {
        "A": "Base",
        "B": "Height",
        "C": "Perimeter",
        "D": "All of these"
      },
      "correct_answer": "C"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "Area=27 cm², height=6 cm. Base=? 🔢",
      "options": { "A": "8 cm", "B": "9 cm", "C": "10 cm", "D": "11 cm" },
      "correct_answer": "B"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "Base=14 m, height=5 m. Area in m²? 🏡",
      "options": { "A": "32 m²", "B": "34 m²", "C": "35 m²", "D": "36 m²" },
      "correct_answer": "C"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "A triangular tile: base=16 cm, height=9 cm. Area? 🧱",
      "options": { "A": "70 cm²", "B": "72 cm²", "C": "74 cm²", "D": "76 cm²" },
      "correct_answer": "B"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "True or False: All triangles use same area formula. ✅❎",
      "options": {
        "A": "True",
        "B": "False",
        "C": "Sometimes",
        "D": "For right triangles only"
      },
      "correct_answer": "A"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "Base=25 mm, height=12 mm. Area in mm²? 📏",
      "options": {
        "A": "140 mm²",
        "B": "145 mm²",
        "C": "150 mm²",
        "D": "155 mm²"
      },
      "correct_answer": "C"
    },
    {
      "id": 21,
      "difficulty": "medium",
      "question": "A triangle has area 36 cm². If base is 12 cm, find height. 📏",
      "options": { "A": "4 cm", "B": "5 cm", "C": "6 cm", "D": "7 cm" },
      "correct_answer": "C"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "Two triangles: First: base=10 cm, height=8 cm. Second: base=8 cm, height=10 cm. Compare areas. ⚖️",
      "options": {
        "A": "First larger",
        "B": "Second larger",
        "C": "Equal",
        "D": "Cannot compare"
      },
      "correct_answer": "C"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "A triangular field has base=50 m, height=24 m. Area in m². 🌾",
      "options": { "A": "550 m²", "B": "575 m²", "C": "600 m²", "D": "625 m²" },
      "correct_answer": "C"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "Triangle area is half of rectangle with same base & height. If rectangle area=84 cm², triangle area=? 🔄",
      "options": { "A": "38 cm²", "B": "40 cm²", "C": "42 cm²", "D": "44 cm²" },
      "correct_answer": "C"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "Area=60 m², height=10 m. Base=? 🧩",
      "options": { "A": "10 m", "B": "11 m", "C": "12 m", "D": "13 m" },
      "correct_answer": "C"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "A triangular window: base=80 cm, height=60 cm. What area of glass needed? 🪟",
      "options": {
        "A": "2200 cm²",
        "B": "2300 cm²",
        "C": "2400 cm²",
        "D": "2500 cm²"
      },
      "correct_answer": "C"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "If base is tripled and height remains same, area becomes? 🔄",
      "options": {
        "A": "Same",
        "B": "Tripled",
        "C": "6 times",
        "D": "9 times"
      },
      "correct_answer": "B"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "Find height when area=56 cm² and base=14 cm. 📐",
      "options": { "A": "6 cm", "B": "7 cm", "C": "8 cm", "D": "9 cm" },
      "correct_answer": "C"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "A triangular park: base=120 m, height=75 m. Area in hectares? (1 hectare=10,000 m²) 🌳",
      "options": {
        "A": "0.4 hectares",
        "B": "0.45 hectares",
        "C": "0.5 hectares",
        "D": "0.55 hectares"
      },
      "correct_answer": "B"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "Area=96 cm², base=16 cm. Height=? ❓",
      "options": { "A": "10 cm", "B": "11 cm", "C": "12 cm", "D": "13 cm" },
      "correct_answer": "C"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "Two triangles have equal areas. First: base=20 cm, height=6 cm. Second: base=15 cm. Find height of second. ⚖️",
      "options": { "A": "7 cm", "B": "8 cm", "C": "9 cm", "D": "10 cm" },
      "correct_answer": "B"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "Base increased by 3 cm, height decreased by 1 cm from original 12 cm base, 10 cm height. New area vs original? 🔄",
      "options": { "A": "Same", "B": "Larger", "C": "Smaller", "D": "Equal" },
      "correct_answer": "B"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "A triangular sheet: base=90 cm, height=60 cm. Area in cm²? 📄",
      "options": {
        "A": "2600 cm²",
        "B": "2650 cm²",
        "C": "2700 cm²",
        "D": "2750 cm²"
      },
      "correct_answer": "C"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "If height is doubled and base halved, area becomes? 🔢",
      "options": { "A": "Same", "B": "Doubled", "C": "Halved", "D": "4 times" },
      "correct_answer": "A"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "Area=108 m², height=12 m. Base=? 📏",
      "options": { "A": "16 m", "B": "17 m", "C": "18 m", "D": "19 m" },
      "correct_answer": "C"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "A triangular sail: base=150 cm, height=80 cm. Area? ⛵",
      "options": {
        "A": "5500 cm²",
        "B": "5750 cm²",
        "C": "6000 cm²",
        "D": "6250 cm²"
      },
      "correct_answer": "C"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "Find base when area=84 cm² and height=12 cm. 🧮",
      "options": { "A": "12 cm", "B": "13 cm", "C": "14 cm", "D": "15 cm" },
      "correct_answer": "C"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "Triangle has same area as parallelogram with base=16 cm, height=6 cm. If triangle base=12 cm, find height. 🔄",
      "options": { "A": "14 cm", "B": "15 cm", "C": "16 cm", "D": "17 cm" },
      "correct_answer": "C"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "Base=18 m, height=14 m. Area difference from rectangle of same dimensions? ⚖️",
      "options": { "A": "0 m²", "B": "63 m²", "C": "126 m²", "D": "252 m²" },
      "correct_answer": "C"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "Area=135 cm², base=18 cm. Height=? 📐",
      "options": { "A": "13 cm", "B": "14 cm", "C": "15 cm", "D": "16 cm" },
      "correct_answer": "C"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "A triangle has area 90 cm². If height is 12 cm, find base. Then if base increased by 3 cm, find new area. 📈",
      "options": {
        "A": "Base=15 cm, New area=108 cm²",
        "B": "Base=15 cm, New area=112.5 cm²",
        "C": "Base=12 cm, New area=99 cm²",
        "D": "Base=14 cm, New area=105 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "Three triangles: A(base=10,h=12), B(base=15,h=8), C(base=12,h=10). Which has largest area? 🏆",
      "options": { "A": "A", "B": "B", "C": "C", "D": "All equal" },
      "correct_answer": "D"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "A triangular field: base=180 m, height=100 m. Find area in hectares. (1 hectare=10,000 m²) 🌾",
      "options": {
        "A": "0.8 hectares",
        "B": "0.9 hectares",
        "C": "1.0 hectares",
        "D": "1.2 hectares"
      },
      "correct_answer": "B"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "From triangle of area 75 cm², height=10 cm. Base=? Then rectangle of same base & height has area? 🔺",
      "options": {
        "A": "Base=15 cm, Rectangle area=150 cm²",
        "B": "Base=12 cm, Rectangle area=144 cm²",
        "C": "Base=15 cm, Rectangle area=140 cm²",
        "D": "Base=14 cm, Rectangle area=140 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "Triangle's height is twice its base. If area=144 cm², find dimensions. 📊",
      "options": {
        "A": "Base=10 cm, Height=20 cm",
        "B": "Base=11 cm, Height=22 cm",
        "C": "Base=12 cm, Height=24 cm",
        "D": "Base=13 cm, Height=26 cm"
      },
      "correct_answer": "C"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "Two triangles: First area 48 cm², base 12 cm. Second has same height but base 16 cm. Area of second? 🔄",
      "options": { "A": "60 cm²", "B": "62 cm²", "C": "64 cm²", "D": "66 cm²" },
      "correct_answer": "C"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "A triangular banner: base=2.4 m, height=1.5 m. Area in m²? 🎌",
      "options": { "A": "1.6 m²", "B": "1.7 m²", "C": "1.8 m²", "D": "1.9 m²" },
      "correct_answer": "C"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "If base decreased by 25% and height increased by 33.33%, area changes by? 📈",
      "options": { "A": "+5%", "B": "No change", "C": "-5%", "D": "+10%" },
      "correct_answer": "B"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "Composite shape has triangle (base=12 cm, height=8 cm) and rectangle (12×6 cm) attached. Total area? 🧩",
      "options": {
        "A": "118 cm²",
        "B": "120 cm²",
        "C": "122 cm²",
        "D": "124 cm²"
      },
      "correct_answer": "B"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "Triangle area 96 cm². Height is ⅔ of base. Find base & height. 🔍",
      "options": {
        "A": "Base=12√2 cm, Height=8√2 cm",
        "B": "Base=16 cm, Height=10.67 cm",
        "C": "Base=18 cm, Height=12 cm",
        "D": "Base=12 cm, Height=8 cm"
      },
      "correct_answer": "A"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "Area=121 cm². If base:height = 11:2, find height. 📐",
      "options": {
        "A": "√11 cm",
        "B": "2√11 cm",
        "C": "3√11 cm",
        "D": "4√11 cm"
      },
      "correct_answer": "B"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "A triangular pool with attached rectangular deck. Triangle: base=20 m, height=12 m. Rectangle: 20×8 m. Total area? 🏊",
      "options": { "A": "260 m²", "B": "270 m²", "C": "280 m²", "D": "290 m²" },
      "correct_answer": "C"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "If triangle area = ½ × parallelogram area with same base & height, and parallelogram area=112 cm², triangle area? 🔺",
      "options": { "A": "54 cm²", "B": "55 cm²", "C": "56 cm²", "D": "57 cm²" },
      "correct_answer": "C"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "Base increased from 10 cm to 15 cm, height decreased from 18 cm to 12 cm. Original vs new area? ⚖️",
      "options": {
        "A": "Original larger",
        "B": "New larger",
        "C": "Equal",
        "D": "Can't compare"
      },
      "correct_answer": "C"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "Garden has triangular section base=40 m, height=25 m and rectangular section 40×20 m. Total area? 🌷",
      "options": {
        "A": "1200 m²",
        "B": "1250 m²",
        "C": "1300 m²",
        "D": "1350 m²"
      },
      "correct_answer": "C"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "Area=169 cm². Height is 0.8 times base. Find base rounded to 1 decimal. 🔢",
      "options": {
        "A": "20.4 cm",
        "B": "20.5 cm",
        "C": "20.6 cm",
        "D": "20.7 cm"
      },
      "correct_answer": "C"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "Two triangles have equal areas. Ratio of bases 2:3, ratio of heights? 📊",
      "options": { "A": "2:3", "B": "3:2", "C": "4:9", "D": "9:4" },
      "correct_answer": "B"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "Triangular wall: base=9.6 m, height=5.5 m. Paint costs ₹200/m². Total cost? 💰",
      "options": { "A": "₹5,200", "B": "₹5,250", "C": "₹5,280", "D": "₹5,300" },
      "correct_answer": "C"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "Triangle divided into 2 equal smaller triangles. If one small triangle area=28.5 cm², original triangle area? 🔺🔺",
      "options": { "A": "55 cm²", "B": "56 cm²", "C": "57 cm²", "D": "58 cm²" },
      "correct_answer": "C"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "Base=24 cm, height=x cm. Area=156 cm². Find x. Then if x increased by 3 cm, new area? 📈",
      "options": {
        "A": "x=13 cm, New area=192 cm²",
        "B": "x=12 cm, New area=168 cm²",
        "C": "x=13 cm, New area=180 cm²",
        "D": "x=14 cm, New area=204 cm²"
      },
      "correct_answer": "A"
    }
  ]
}