Q10 of 31 Page 234

and touch the circle with centre 0 at A and B respectively. If m∠OPB = 30 and OP = 10, then radius of the circle =

Given ∠OPB = 30° and OP = 10



In right angled ΔOBP,


Consider sin30° =


⇒ 1/2 =


⇒ OB = 5


∴ Radius of circle = OB = 5

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