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Which option has only three-dimensional forms?

Answer and explanation

Correct answer: Cube and sphere

The direct answer is A: a cube and a sphere. A three-dimensional form has three measurable dimensions—length, breadth, and depth—and occupies space. A cube has flat faces, edges, and depth. A sphere has a rounded surface and depth in every direction. Therefore both are three-dimensional forms. Option A is correct. Option B, a circle and a square, are ordinarily two-dimensional plane shapes: they have length and breadth but no physical depth in their drawn form. Option C, a line and a dot, are basic visual elements and do not represent three-dimensional forms here. Option D, a triangle and a rectangle, are also two-dimensional plane shapes. The important distinction is shape versus form: shape is flat; form has volume or depth. Memory cue: depth means form; no depth means shape.

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FormThree DimensionalCube Sphere

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