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Chapter 4.CR, Problem 23CR
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### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

#### Solutions

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BuyFindarrow_forward

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

# Review ExercisesIn Review Exercises 22 to 24, M and N are the midpoints of F J - and F H - respectively. Given: J H = 12 m ∠ J = 80 ° m ∠ F = 60 ° Prove: M N ,   m ∠ F M N ,   m ∠ F N M

To determine

To Find:

The length of the line joining the mid points of the sides of the triangle and measure of angles based on the information provided.

Explanation

Formula Used:

Sum of the interior angle of a triangle is 180Â°.

Theorem on triangle:

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

That is, âˆ†ABC with midpoints M and N of AB- and AC-, respectively. Then MN-âˆ¥BC-. It can be concluded that BC=12(MN)

Calculation:

It is given that âˆ†FJH is an isosceles triangle with M and N are the midpoints of FJ- and FH- respectively.

Also given that JH=12, mâˆ J=80Â° and mâˆ F=60Â°.

Applying the theorem, MN is parallel to JH.

So mâˆ FHJ=mâˆ FNM and mâˆ FJH=mâˆ FMN.

Here mâˆ J=80Â°

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