If three central angles measures 65, 87, and 112, find the measure of the fourth central angle.
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That depends on the quadrilateral. They will not all have the same measure. Even rectangles will not all have the same central angle measures.
The "Far Arc Near Arc theorem" is used in finding the angle measures of a secant.
If the central angle is 70 and the radius is 8cm, how do you find out the chord lenght?
180 degrees is a straight line