1. Warm-up Name the intersection of plane AEH and plane GHE.
What plane contains points B, F, and C?
What plane contains points E, F, and D?

2. The midpoint of a segment is a point that divides the segment into two congruent segments.
A point, line, ray, or other segment that intersects a segment at its midpoint is said to bisect the segment.
The point, line, ray, or segment is called a segment bisector. A M B

3. Using the Midpoint Q is the midpoint of PR. What are PQ, QR, and PR?
Find x.
6x – 7 = 5x + 1
x – 7 = 1
x = 8
Find PQ and QR.
PQ = 6x – 7
= 6 ( 8 ) – 7
= 41
Find PR.
PR = PQ + QR = = 82.

4. Practice
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