A sphere is a three-dimensional solid with a completely curved, round surface; it has no flat faces, straight edges, or vertices, and it can look the same from different orientations. The learner distinguishes spheres from circles and from other solids by their geometric attributes rather than by color, size, or resemblance to a familiar object, supporting later classification and description of three-dimensional shapes.
A sphere is a solid shape that is completely round and curved.
To identify a sphere, check:
A sphere can look the same when you turn it. Do not use its color or size to decide.
Example:
Shape A is a solid, round shape. It has no flat parts, no straight edges, and no corners.
So, Shape A is a sphere.
A flat, round shape is a circle, not a sphere. A box is not a sphere because it has flat faces, straight edges, and corners.
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