Which solid has two congruent circular bases?

Which solid has two congruent circular bases?

• A. Cone
• B. Cylinder
• C. Sphere
• D. Prism

Answer: (B)

The concept here is identifying a solid by its bases. The cylinder is the shape that has two parallel, congruent circular bases connected by a curved surface. Congruent means the two circular bases are the same size and shape, so you have exactly two circles at the ends. Think about the other shapes: a cone has one circular base and a pointed tip, so it doesn’t have two bases. A sphere has no bases at all. A prism has two bases too, but those bases are polygons (like rectangles or triangles), not circles. So it doesn’t fit the description of two congruent circular bases. Because it uniquely has two identical circular bases, the cylinder is the correct solid.

The concept here is identifying a solid by its bases. The cylinder is the shape that has two parallel, congruent circular bases connected by a curved surface. Congruent means the two circular bases are the same size and shape, so you have exactly two circles at the ends.

Think about the other shapes: a cone has one circular base and a pointed tip, so it doesn’t have two bases. A sphere has no bases at all. A prism has two bases too, but those bases are polygons (like rectangles or triangles), not circles. So it doesn’t fit the description of two congruent circular bases.

Because it uniquely has two identical circular bases, the cylinder is the correct solid.