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Referring to the figure, you can find m ∠AFB if you know which of the following angle measures?

Explanation

The figure indicates that ∠AFE is a right angle (m∠FFE = 90°). That angle and ∠AFD are supplementary. (They combine to form a straight 180° line). Therefore, m∠AFD= 90°. If you know m∠BFD , you can find m∠AFB by subtracting from 90.

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