Two concentric circles are of radii of 5 cm and 3 cm and center at O. two tangents PA and PB arr drawn to two circles from an external point P such that AP = 12 cm. Find BP
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OP = √ 12^2 +5^2 = √144 +25 = √169.= 13
PB = √OP^2 - OB^2
= √169 -9 = √160 = 4√10
PB = √OP^2 - OB^2
= √169 -9 = √160 = 4√10
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