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Mathematics 21 Online
OpenStudy (anonymous):

In circle A shown below, m BC is 61° and m EF is 76°. What is m∡FDE??

OpenStudy (anonymous):

OpenStudy (anonymous):

The angle FDE equals angle BDC and is the average of the two arc lengths. For a proof, you could see here: http://telliott99.blogspot.com/2011/04/arcs-of-circle.html about half way down.

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