# Chapter 1 - Tools of Geometry - 1-2 Points, Lines, and Planes - Got It? - Page 14: 3

a) Plane BFG and plane BFE b) Because two points form a line and two planes intersect in a line.

#### Work Step by Step

a) $\overset\longleftrightarrow{BF}$ is part of the right side of the cube and part of the front of the cube. The right and front are each part of a plane. Those planes can be named by any 3 points that make up those sides. b) Postulate 1.3 tells us the intersection of two planes is a line. Postulate 1.1 tells us that a line can be defined by any two points the line passes through.

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