Question

diameter is 17.5 find the circumference of circle

Answer 1

Radius is 8.75 
 circumference of circle  =2 x pi x r
                                      =2x22/7x8.75
                                      =55
                   

Answer 2

we know that,

diameter = 17.5 ; radius = 17.5/2

circumference =
$2\pi \: r$
=2(22/7) (17.5/2)

55 is the answer