AB IS A TANGENT. find the length of the radius
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In triangle OAB
A is right angle (Tangent makes an angle of 90 degree with the radius)
By using Pythagoras Theorem
H² = B² + P²
15² = 12² + P²
225 = 144 + P²
225 - 144 = P²
P² = 81
P = 9 cm
Radius = 9cm
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