Question

If difference between circumference and radius of a circle is 37m then what is the diameter?

a) 18m        b) 24m          c)14m        d)7m       e)none

Answer 1

2$\pi$r-r=37
r(2$\pi$-1)=37
r(2*22/7-1)=37
r=7
d=14

Answer 2

circumference of circle=2 pi R
radius=R
so difference=2 pi R-R=37m
so R*6.28=37m
   R=5.89m
so diameter=R*2
                 =11.78m
so    D=none