Find the value of x in this figure.
A) 43
B) 47
C) 53
D) 57

Answer: 47 (choice B)
x+43 = 90
x = 90 - 43
x = 47
This works because triangle PQR is a right triangle (with angle Q as the 90 degree angle). We say that that P and R are complementary angles. I added point R to be located where the angle x is written.