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प्रश्न
In Fig. 1, PA and PB are two tangents drawn from an external point P to a circle with centre C and radius 4 cm. If PA ⊥ PB, then the length of each tangent is:
विकल्प
(A) 3 cm
(B) 4 cm
(C) 5 cm
(D) 6 cm
उत्तर
Since `APbotPB,CA botAP,CBbotBP `
and AC = CB = radius of the circle, therefore APBC is a square having side equal to 4 cm.
Therefore, length of each tangent is 4 cm.
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