Question

find the circumference of the circle whose radius @3.5

Answer 1

circumference = 2 π r
this implies 2 x 22/7 x 3.5
= 44 x 0.5
= 22

Answer 2

circumference of a circle is 2$\pi$ r 
given: r = 3.5
.:. 2*3.14*3.5
= 21.99 [ approx ]

thank you