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OpenStudy (anonymous):
Given: DR tangent to Circle O. If m DB = 150°, then A = degrees click pic below
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OpenStudy (anonymous):
OpenStudy (anonymous):
Not sure why you would need that DR is tangent to Circle O (Geometry was a while ag for me), but since m(arc DB) = 150, m(arc DCB) = 210. Since point A is on the circle, m(angle A) = (1/2)m(arc DCB) = (1/2)(210) = 105.
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