SSC CPO SI and ASI Model Paper 7

Question : 127 of 200

Marks: +1, -0

Two circles with radii r1 = 3 cm and r2 = 2 cm are placed such that the distance between their centers is d = 13 cm. What is the length l of direct tangent?

18 cm
13 cm
168 cm
8 cm

Validate

Solution:

(3) Let "OP" be the distancebetween centers, "OA" and "PB" bethe radii,

In triangle ABC,

I=√{d^2-(r_1-r_2)^2}

√{13^2-1^2}=√16 cm

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