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Question

In ABC, AB=AC and A:B=8:5. Then measure of A in degrees is

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Solution

A:B=8:5
Let A=8x,B=5x
Given, AB=AC
Thus, B=C=5x (Isosceles triangle property)
Sum of angles of triangle = 180
8x+5x+5x=180
18x=180
x=10
hence, A=8x=80

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