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Mathematics 15 Online
OpenStudy (anonymous):

In the diagram below, Circle O is circumscribed about quadrilateral DEFG. What is the value of X?

OpenStudy (anonymous):

http://tinypic.com/r/51wnm1/5

OpenStudy (anonymous):

The circle arc subtended by the 119 angle is 2 x 119 = 238 degrees. x subtends (360 - 238) or 122 degrees. So x = 122 / 2 or 61 degrees. These inscribed angles always subtend an arc of the circle equal to 2 times the angle.

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