A cylinder is a three-dimensional solid with two congruent, parallel circular bases connected by one curved surface. The learner identifies cylinders in different orientations and distinguishes them from cones, spheres, and prisms by their defining faces and surfaces rather than by overall appearance; measurement formulas, volume, surface area, and more general cylinder classifications are not included.
A cylinder is a solid shape with:
The cylinder can stand up or lie on its side. Its position does not change its shape.
Example: Which object is a cylinder?
Step 1: Look for circular ends.
A soup can has a circle on each end.
Step 2: Check that the circles match.
The two circles on the can are the same size and are parallel.
Step 3: Look at the surface between the circles.
The can has one curved surface connecting its circular ends.
Answer: C, the soup can. It is a cylinder even though it is lying down.
A ball has no flat circular faces, a cone has only one circular face, and a box has flat rectangular faces.
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