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Identify cylinders

A cylinder is a three-dimensional shape with two matching, parallel circular faces joined by one curved surface; its position or size does not change its identity. The learner distinguishes cylinders from spheres, cones, and prisms by these defining features, including when a circular face appears oval in a drawing. Formal measurement of volume, surface area, nets, and curved-surface properties is not included.

Detailed Explanation: Identify cylinders

A cylinder is a solid shape with:

  • two matching, flat, circular faces
  • the circles are on opposite, parallel ends
  • one curved surface joins the circles

The circles may look like ovals in a picture because the cylinder is tilted. They are still circles.

Example: Look at a picture of a soup can.

  1. Check the top and bottom. They are both circular faces.
  2. Check that the two circles match in size and shape.
  3. Notice the smooth curved side joining them.
  4. The soup can has all the features of a cylinder, so it is a cylinder.

A sphere has no flat circular faces. A cone has only one circular face and comes to a point. A prism has flat faces instead of one curved surface.

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Identify Shapes 3D - Count Cylinders


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