Geometry 3d Shapes Hard — Set 51

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        "operation": "geometry",
        "subject": "arithmetic",
        "difficulty": "hard",
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        "problems": [
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                "id": 1,
                "type": "geometry",
                "subType": "count-sides",
                "shape": "rectangle",
                "question": "How many sides does a rectangle have?",
                "answer": 4,
                "correctAnswer": "4",
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                "id": 2,
                "type": "geometry",
                "subType": "count-sides",
                "shape": "pentagon",
                "question": "How many sides does a pentagon have?",
                "answer": 5,
                "correctAnswer": "5",
                "difficulty": "hard"
            },
            {
                "id": 3,
                "type": "geometry",
                "subType": "count-sides",
                "shape": "square",
                "question": "How many sides does a square have?",
                "answer": 4,
                "correctAnswer": "4",
                "difficulty": "hard"
            },
            {
                "id": 5,
                "type": "geometry",
                "subType": "count-sides",
                "shape": "octagon",
                "question": "How many sides does a octagon have?",
                "answer": 8,
                "correctAnswer": "8",
                "difficulty": "hard"
            },
            {
                "id": 6,
                "type": "geometry",
                "subType": "count-sides",
                "shape": "hexagon",
                "question": "How many sides does a hexagon have?",
                "answer": 6,
                "correctAnswer": "6",
                "difficulty": "hard"
            },
            {
                "id": 7,
                "type": "geometry",
                "subType": "area",
                "shape": "rectangle",
                "question": "What is the area of a rectangle with length 47 and width 11?",
                "answer": 517,
                "correctAnswer": "517",
                "difficulty": "hard"
            },
            {
                "id": 8,
                "type": "geometry",
                "subType": "perimeter",
                "shape": "circle",
                "question": "What is the perimeter (circumference) of a circle with radius 18? (use π ≈ 3.14)",
                "answer": 113.1,
                "correctAnswer": "113.1",
                "difficulty": "hard"
            },
            {
                "id": 10,
                "type": "geometry",
                "subType": "perimeter",
                "shape": "octagon",
                "question": "What is the perimeter of a octagon with each side = 6?",
                "answer": 48,
                "correctAnswer": "48",
                "difficulty": "hard"
            },
            {
                "id": 12,
                "type": "geometry",
                "subType": "identify-shapes",
                "shape": "hexagon",
                "question": "What is the name of a shape with 3 sides?",
                "answer": "triangle",
                "correctAnswer": "triangle",
                "difficulty": "hard"
            },
            {
                "id": 14,
                "type": "geometry",
                "subType": "perimeter",
                "shape": "hexagon",
                "question": "What is the perimeter of a hexagon with each side = 20?",
                "answer": 120,
                "correctAnswer": "120",
                "difficulty": "hard"
            },
            {
                "id": 15,
                "type": "geometry",
                "subType": "perimeter",
                "shape": "triangle",
                "question": "What is the perimeter of a triangle with each side = 18?",
                "answer": 54,
                "correctAnswer": "54",
                "difficulty": "hard"
            },
            {
                "id": 16,
                "type": "geometry",
                "subType": "identify-shapes",
                "shape": "pentagon",
                "question": "What is the name of a shape with 4 sides?",
                "answer": "rectangle",
                "correctAnswer": "rectangle",
                "difficulty": "hard"
            },
            {
                "id": 17,
                "type": "geometry",
                "subType": "area",
                "shape": "circle",
                "question": "What is the area of a circle with radius 7? (use π ≈ 3.14)",
                "answer": 153.94,
                "correctAnswer": "153.94",
                "difficulty": "hard"
            },
            {
                "id": 18,
                "type": "geometry",
                "subType": "area",
                "shape": "square",
                "question": "What is the area of a square with side 36?",
                "answer": 1296,
                "correctAnswer": "1296",
                "difficulty": "hard"
            },
            {
                "id": 19,
                "type": "geometry",
                "subType": "perimeter",
                "shape": "pentagon",
                "question": "What is the perimeter of a pentagon with each side = 41?",
                "answer": 205,
                "correctAnswer": "205",
                "difficulty": "hard"
            },
            {
                "id": 20,
                "type": "geometry",
                "subType": "count-sides",
                "shape": "circle",
                "question": "How many sides does a circle have?",
                "answer": 0,
                "correctAnswer": "0",
                "difficulty": "hard"
            }
        ],
        "layout": {
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    "_archetype": "form-exercise",
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