SSC CHSL 2012 · Question 147 of 202

The length of radius of a circumcircle of a triangle having sides 3 cm, 4 cm and 5 cm is:

A2 cm
B2.5 cmCorrect
C3 cm
D1.5 cm

Answer: B. 2.5 cm

Explanation

Circumradius of a triangle abc = ( )( )( )( ) + + + - + - + - a b c a b c b c a a c b ´ ´ 3 4 5 = ( )( )( )( ) + + + - + - + - 3 4 5 3 4 5 4 5 3 3 5 4 60 = 2.5 cm = ´ ´ ´ 12 2 6 4 125 100 ´ = x 100

Source: SSC CHSL Solved Paper 04-11-2012 (Disha Publications) · reliable-secondary

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