   Chapter 4.2, Problem 39E ### Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698

#### Solutions

Chapter
Section ### Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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# Prove that the segment that joins the midpoints of two sides of a triangle has a length equal to one-half the length of the third side.(HINT: In the drawing, M N ¯ is extended to D , a point on C D ¯ . Also, C D ¯ is a parallel to A B ¯ .) To determine

To prove:

The segment that joins the midpoints of two sides of a triangle has a length equal to one-half the length of the third side.

Explanation

Formal proof:

Statement:

The segment that joins the midpoints of two sides of a triangle has a length equal to one-half the length of the third side.

Drawing:

Given:

ABC is a triangle with M and N as the midpoint of the sides AB and AC respectively.

ANCN

AMBM

Prove:

MN=12BC

 PROOF Statement Reasons 1. AM¯≅BM¯AN¯≅CN¯ 1. Given 2. Produce MN to D to meet CD which is parallel to AB. 2. Construct a parallelogram BCDM 3

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