Answer: 72°
Explanation:
Since AG ║ BH, then ∠GDE and ∠BEF are supplementary angles.
⇒ ∠GDE + ∠BEF = 180°
4x + 6x = 180
10x = 180
x = 18
∠GDE = 4x
= 4(18)
= 72
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