Question
In the figure, AB is perpendicular to DE. ∠CEF = ∠AED. Given that ∠DEF is 3 times as large as ∠CED, find ∠CEB.
2 m

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In the figure, AB is perpendicular to DE. ∠CEF = ∠AED. Given that ∠DEF is 3 times as large as ∠CED, find ∠CEB.