If the circle was 36in = across/diameter

the radios would be 18in

so the sum on a scientific calculator would be 2*pi*r (r=radios) (radios=18)

the answer would be: 113.0973355292326in

but you would round it down to 113in

the radios would be 18in

so the sum on a scientific calculator would be 2*pi*r (r=radios) (radios=18)

the answer would be: 113.0973355292326in

but you would round it down to 113in