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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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Chapter
Section
BuyFindarrow_forward

Elementary Geometry For College St...

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

In Exercises 34 to 39, write a formal proof of each theorem.

If the midpoints of the sides of a rectangle are joined in order, the quadrilateral formed is a rhombus.

To determine

To write:

A formal proof of the given theorem.

Explanation

Calculation:

Given: If the midpoints of the sides of a rectangle are joined in order, the quadrilateral formed is a rhombus.

Consider the rectangle ABCD and the quadrilateral formed by joining the midpoints E, F, G, H of the sides of the rectangle.

Consider a rectangle with its longest side being horizontal.

The rhombus will form four triangles, each in a corner of the rectangle.

By the definition of midpoint, the two sides next to the 90 degree angles for the all of the triangles will be congruent.

By SAS, this means that the triangles are congruent.

Since sides opposite to each other are congruent, it is a parallelogram.

Since adjacent sides are congruent and it is a parallelogram, it is a rhombus.

AEH EBF 

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