Difference between revisions of "2007 AMC 10B Problems/Problem 4"
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Revision as of 17:25, 27 May 2011
Problem 4
The point is the center of the circle circumscribed about with and as shown. What is the degree measure of
Solution
Because all the central angles of a circle add up to
Therefore, the measure of is also Since the measure of an inscribed angle is equal to half the measure of the arc it intercepts,