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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

Find EF if:

a) D F = 17 and D E = 15 .

b) D F = 12 and D E = 8 2 .

Exercises 7-10

To determine

(a)

To Find:

The length of EF¯.

Explanation

Given DF=17 and DE= 15,

And figure,

From the figure,

ΔDEF is a right triangle with right angle E

From the Pythagorean Theorem,

The square of the length of hypotenuse of a right triangle is equal to the sum of the square of the lengths of the other two sides.

From the figure, DF¯ is the hypotenuse,

DF2=EF2+D

To determine

(b)

To Find:

The length of EF¯.

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