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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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BuyFindarrow_forward

Elementary Geometry For College St...

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

Where point D lies on A B - , let C D - name the angle-bisector of A C B . In terms of a ,   b , and c , find A D and D B .

Exercises 34. 35

To determine

To find:

AD and DB In terms of a, b, and c, where point D lies on AB-, let CD- name the angle-bisector of ACB.

Explanation

Given figure is,

The above figure shows the triangle ABC.

a is the length of CB

b is the length of AC

c is the length of AB

Angle Bisector theorem: It says that an angle bisector of a triangle will divide the opposite side into two segments that are proportional to the other sides of the triangle.

D is the point lies on AB and joining CD as shown in the figure.

Let BD is the length of x and AD is the length of c-x

BDBC=DAAC

xa=(c-x)b

Simplifying the above equation as below,

xab=c-x

bax=c-x

x=ab(c-x)

x=cab-xab

x+xab=cab

x1+ab=acb

xa+bb=a</

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