Question

Use this figure to calculate the size of ∠EOC.

A. 90°
B. 31°
C. 149°
D. 59°

Answer 1

angle AOC is a 90 degree angle

AOC is spli into 2 angles AOE and EOC

AOE is given as 31 degrees
 so EOC would be 90 degrees minus 31 degrees

90 -31 = 59

EOC = 59 degrees

the answer would be D.