Answer: 72
=========================================================
Step-by-step explanation:
The angle x is a base angle of the isosceles triangle. The unmarked angle is also x, since the base angles of isosceles triangles are congruent.
For any triangle, the three angles always add to 180
x+x+36 = 180
2x+36 = 180
2x = 180-36
2x = 144
x = 144/2
x = 72