SSC CHSL 15 Nov 2015 Shift 1 Paper

Question : 119 of 199

Marks: +1, -0

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 =

√{d^2-(r_1+r_2)^2

√{(15)^2-(6+3)^2}

√{225-81}=√144=12cm

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