The size of angle ∠EOC is 59 degrees.
Option D is correct.
What is an angle?
An angle is defined as the amount of turn between two straight line that share a common end point. Angles are measured in degrees.
Given
< EOA = 31 degrees
< AOC = 90 degrees
From the figure , we get
< AOC = < EOA + < EOC
⇒ \(90^{0}=31^{0}+ < EOC\)
< EOC = \(90^{0}-31^{0}\)
< EOC = 59 degrees
Hence, the size of angle ∠EOC is 59 degrees.
Option D is correct.
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