Question

find the radius of circle whose circumference is 30.8 m

Answer 1

2r*pi=30.8

30.8*7/22=2r

215.6/22=2r

9.8=2r

we know that 2r is equal to the diameter  

so the diameter is 9.8cm

hope its help you?

Answer 2

Hey Friend

Radius = d/2

= 30.8 / 2

= 15.4 m

NB. :

To find the radius with the diameter given, we divide the diameter by 2.

Reason - 2 Radius is equal to 1 diameter.

To find the diameter with the radius given, we multiply the radius by 2.

Reason - 2 Radius is equal to 1 diameter.

Hope it helps ☺☺☺

BEST OF LUCK ✌