IBPS RRB Office Assistant 13 Sep 2015 Paper

(1) Radius of circle A = rmetre (let)
According to the question,
2πr + 2r = 203
⇒ 2r(π+1) = 203
⇒2r (

22

7

+1 )=203
⇒2r×

29

7

=203
⇒r=

203×7

2×29

=24.5 metre
∴ Radius of circle B
= 24.5 – 10.5 = 14 metre
∴ Circumference of circle B
= 2 ×

22

7

× 14 = 88 metre