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Q.

The length of the tangent drawn to a circle with radius 'r' from a point P 

which is 'd' units away from the centre is

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a

d2+r2

b

dr

c

d+r

d

d2−r2

answer is A.

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Detailed Solution

Question Image

We know that OQ⊥PQ

In right angled ΔOPQ

(OP)2=(PQ)2+(OQ)2(PQ)2=(OP)2−(OQ)2PQ=d2−r2

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