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Mathematics 9 Online
OpenStudy (anonymous):

Quadrilateral OPQR is inscribed inside a circle as shown below. What is the measure of angle O? https://vcsohio.brainhoney.com/Resource/29604429,0/Assets/94874_55a92817/09_08_12.gif

jhonyy9 (jhonyy9):

do you know that the sum of all angles is 360 degee - try using this like a first step

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