Question 119
The distance between the centers of two circles of radii 6 cm and 3 cm is 15 cm. The length of the transverse common tangent the circle is:
Solution
Two circles having radii $$r_1$$ and $$r_2$$ and distance between them $$d$$
Length of transverse common tangent PQ = $$\sqrt{d^2-(r_1+r_2)^2}$$
= $$\sqrt{(15)^2-(6+3)^2}$$
= $$\sqrt{225-81}=\sqrt{144}=12$$ cm
=> Ans - (D)
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