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CBSE Class 10 Answered

O is the centre of a circle of radius 8 cm. The tangent at A on the circle cuts a line through O at B such that AB = 15 cm. Find OB.
Asked by Topperlearning User | 05 Oct, 2017, 10:04: AM
answered-by-expert Expert Answer
 
 OA  AB.
By Pythagoras Theorem,
OB2 = OA2 + AB2
OB2 = 82 + 152
OB2 = 64 + 225
OB2 = 289 
OB2 = 172  
OB = 17 cm.
 
Answered by | 05 Oct, 2017, 12:04: PM

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