A sphere is a perfectly round 3D shape, like a ball. Every point on its surface is the same distance from its center. Think of it as a circle that has been rotated all the way around.
A cylinder is a 3D shape with two parallel circular bases connected by a curved surface. Imagine a can of soup or a cardboard tube; that's a cylinder!
| Feature | Sphere | Cylinder |
|---|---|---|
| Definition | A perfectly round 3D shape. | A 3D shape with two parallel circular bases connected by a curved surface. |
| Faces | 0 (It has a curved surface, but no flat faces) | 3 (2 circular bases and 1 curved surface) |
| Edges | 0 | 2 (where the curved surface meets each circular base) |
| Vertices | 0 | 0 |
| Formula for Surface Area | $4\pi r^2$ | $2\pi r h + 2\pi r^2$ |
| Formula for Volume | $\frac{4}{3}\pi r^3$ | $\pi r^2 h$ |
| Examples | Basketball, globe, marble | Can of soup, cardboard tube, candle |
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