Question

unit 1 lesson 13 cumulative practice problems

1. select all the polyhedra.

a
b
c
d
e
a. a
b. b
c. c
d. d
e. e

Explanation:

Step1: Recall polyhedron definition

A polyhedron is a three - dimensional shape with flat polygonal faces, straight edges and sharp vertices.

Step2: Analyze option A

It is a pyramid with flat triangular and polygonal faces, straight edges and vertices, so it is a polyhedron.

Step3: Analyze option B

It has flat polygonal faces, straight edges and vertices, so it is a polyhedron.

Step4: Analyze option C

A cone has a curved surface, so it is not a polyhedron.

Step5: Analyze option D

It is a prism with flat polygonal faces, straight edges and vertices, so it is a polyhedron.

Step6: Analyze option E

A sphere has a curved surface, so it is not a polyhedron.

Answer:

A. A, B. B, D. D