AO and OC are both radii of the circle. Length AO = Length OC Draw the line OB. It creates two triangles OCB and OAB. These share the length OB.
https://doi.org/10.4169/amer.math.monthly.121.03.263 • https://www.jstor.org/stable/10.4169/amer.math.monthly.121.03.263 Copy URL ...
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