Answer:
Explanation:
Assuming DEF is a straight line, the two angles are supplementary.
(18x - 9) + (4x + 13) = 180
22x + 4 = 180
22x = 176
x = 8
m∠DEG = (18(8) - 9) = 135°
135 degrees
Angle DEG and GEF are supplementary (their measures add up to 180 degrees).
The measure of angle DEG is 18(8) - 9 = 144 - 9 = 135 degrees
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