To find:The measure of the vertex

Answer to Problem 10PSA
The measure of the vertex angle is
Explanation of Solution
Given information:The following statement has been given
The vertex of an isosceles triangle is twice as large as one of the base angles
Formula used:The base angles of an isosceles triangle are congruent
Calculation:We know that base angles of an isosceles triangle are congruent
Thus, is vertex angle being twice as large as one of the base angles, then it is twice as large as both of the base angles. Hence, we can say that
Where x is the vertex angle and yis the base angle.
Hence, on solving the two equations, we get
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