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In the diagram of circle O, what is the measure of <abc?
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In the diagram of circle O, what is the measure of <abc?

In the diagram of circle O, what is the measure of <abc?-example-1
User Chuck Wooters
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The angle formed by the intersection of 2 tangents outside the circle equals half the difference of the intercepted arcs.

near arc = 150°
far arc = 360 - 150 = 210°

m∠ABC = (210 - 150)/2 = 30°
User Elnur Abdurrakhimov
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