## Geometry: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 1 - Tools of Geometry - 1-2 Points, Lines, and Planes - Practice and Problem-Solving Exercises: 68

#### Answer

a) The four planes that form the faces are ABC, ACD, ABD and BCD. b) $\overset\longleftrightarrow{AD}$, $\overset\longleftrightarrow{BD}$, $\overset\longleftrightarrow{CD}$

#### Work Step by Step

a) Each side of the tetrahedron is a plane. b) You can see in the figure that 3 lines lead to point D.

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