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Question

If two tangents inclined at an angle of 60° are drawn to a circle of radius 3 cm, then the length of each tangent is

(a) 3 cm
(b) 332 cm
(c) 33 cm
(d) 6 cm

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Solution

(c) 33 cm

Given, PA and PB are tangents to circle with centre O and radius 3 cm andAPB=600.Tangents drawn from an external point are equal; so, PA=PB.And OP is the bisector ofAPB, which givesOPB=OPA=300.OAPA. So, from right-angled OPA, we have: OAAP=tan300OAAP=133AP=13AP=33 cm

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