SOLUTION: The given traingles is an isosceles triangle with AB=AC. If Angle A measures 78 degrees find the measure of Angle B

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Question 1149290: The given traingles is an isosceles triangle with AB=AC. If Angle A measures 78 degrees find the measure of Angle B
Answer by ikleyn(52780) About Me  (Show Source):
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The given highlight%28cross%28traingles%29%29 triangle is an isosceles triangle with AB=AC. If Angle A measures 78 degrees find the measure of Angle B
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The measure of the angle B is m(B) = %28180-78%29%2F2 = 51 degrees. 

    Rationales :


        a)  the angles at the base of an isosceles triangle are congruent,  and

        b)  the sum of interior angles of each triangle is 180 degrees.