SSC CGL 19 Oct 2014 Shift 2 Paper

Question : 143 of 200

Marks: +1, -0

Two circles are of radii 7 cm and 2 cm their centres being 13cm apart. Then the length of direct common tangent to the circles between the points of contact is

12 cm
15 cm
10 cm
5 cm

Validate

Solution:

Direct common tangent
=

-(r_1-r_2)^2

√{(13)^2-(7-2)^2}

√{169-25}

√{144}

= 12 cm

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