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Inscribed Angles - Problem 3 3,331 views
Recall that the measure of the intercepted arc of an inscribed angle is twice the measure of that inscribed angle. Also recall that the sum of all angles in a circle is 360°. So, in order to find a missing arc measure, subtract the known arc measures from 360°. Then, it is possible to find any inscribed angle, since all of their intercepted arcs are known. When inscribed angles intercept the same arc, their measures are congruent.
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