Question

If the measure of arc EF=47 and the measure of angle ACD=55, determine the measure of angle ECF. I really need help with this, thank you!!

Answer 1

55°

Explanation:

∠ECF is a vertical angle with ∠ACD, so has the same measure, 55°.

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Whatever arc may exist between points E and F is not shown on your diagram, nor is the center (or radius) of it shown. The measure of arc EF is irrelevant to the question.