This is a semi-circle window that is in the front of my house. In this window the 3 segments CF, DF, and BF are congruent through the one central angle to the edge of the arc. Also in this picture the 4 angles coming out of the center point F are congruent to each other because of their congruent arcs and central angle. Note: the measurements are not exactly congruent because the point is not in the exact center of the window. (~AD1)
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