The measure of ∠EFC in the circle is 53.5 degrees
Equation
An equation is used to show the relationship between two or more numbers and variables.
∠EOD + ∠EOF = 90° (right angle)
∠EOF + 17 = 90
∠EOF = 73°
In triangle OEF, OE = OF (radii), hence: ∠OEF = ∠OFE
Let ∠OFE = x
∠OEF + ∠OFE + ∠EOF = 180 (angles in a triangle)
x + x + 73 = 180
x = 53.5°
The measure of ∠EFC in the circle is 53.5 degrees
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