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Q.

The length of a common internal tangent to two circles is 5 and a common external tangent is 15, then the product of the radii of two circles is:

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a

25

b

50

c

75

d

30

answer is B.

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Detailed Solution

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d2−(r1−r2)2=15;   d2−(r1+r2)2=5   ⇒r1r2=50

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