Math

In triangle ABC, the measure of angle A is 80 degrees and the measure of angle B is 50 degrees. If the length of AB is 2x - 12 and the length of AC is x - 3, what is the length of AB?
A) 15
B) 12
C) 9
D) 6
E) 3

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  1. 80 + 50 = 130
    SO C = 50
    and we have an isosceles triangle with
    AB = AC
    so
    2x-12 = x-3
    or
    x = 9

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