SOLUTION: Vertex angle A of isosceles triangle ABC measures 20 more than three times m<B. Find the measure of all three angles

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Question 135092: Vertex angle A of isosceles triangle ABC measures 20 more than three times m
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Sum of the angles in a triangle is 180.
Base angles of isosceles triangles are equal. They equal m
The vertex angle = 3m+%2B+20%29
So
180+=+m+%2B+m+%2B+%283m%2B20%29+
180+=+5m+%2B+20
160+=+5m+
32+=+m
116 = vertex angle