in degrees.
AB and CB are tangents to the circle. Find
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The tangents to a circle drawn from an external point are equal, and make equal angles with the line joining the point to the center. A tangent line makes an angle of 90 degrees with the radius of the circle.
inscribed angle = 2 1 i n t e r c e p t e d a r c
< A D C = 2 1 ( 6 5 )( 2 ) = 6 5 ∘