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Two parallel tangents to a given circle ...

Two parallel tangents to a given circle are cut by a third tangent at the points `Aa n dBdot` If `C` is the center of the given circle, then `/_A C B` (a)depends on the radius of the circle. (b)depends on the center of the circle. (c)depends on the slopes of three tangents. (d)is always constant

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