Question

im working on isoceles and equilateral triangles in geometry and I don't know how to solve this question for x

Answer 1

Take into account this is an isosceles triangle, then, there are two angles with measures 72°.

Then, the value of x is the result of subtracting two times 72 to 180 (becasue the sum of the interior angles of any triangle is 180) just as follow:

x = 180 - 2(72)

x = 180 - 144

x = 36

Hence, the value of x is 36°