Question:
In the figure below, ABC is an equilateral triangle and CDE is an isosceles triangle with DC = DE. Point E lies on the side AB of the equilateral triangle. ∠CDE = 36° and ∠ECB = 321°.
Find ∠EFC.

Solution:

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In the figure below, ABC is an equilateral triangle and CDE is an isosceles triangle with DC = DE. Point E lies on the side AB of the equilateral triangle. ∠CDE = 36° and ∠ECB = 321°.
Find ∠EFC.