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Find mFDE, given that EF is a diameter of the circle

User Unwired
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The measure of angle FDE must be 90 degree, if D is a point on the circle. If D is not a point on the circle, we are unable to determine the measure of angle FDE.

When you have angle with the vertex on a circle and the sides go through the ends of the diameter, the angle is always a right angle.
User FatherOfWine
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