9514 1404 393
Answer:
x = 63
Step-by-step explanation:
The base angles of each isosceles triangle are equal, so we can write the sum of the four angles in the quadrilateral as ...
72° +(72° +x°) +x° +90° = 360° . . . . . clockwise from upper left
2x = 126 . . . . . . . . . divide by °, subtract 234
x = 63 . . . . . . . . . . . divide by 2
