Question

find the redius of a circle whose circumference is 30.8

Answer 1

circumference is 2πr= 30.8

radius r=30.8/2π

radius r==30.8/2*3.141

radius r=4.90

Answer 2

Let the radius be r.
Circumference = 30.8
Formula of Circumference = 2πr

So, 2πr = 30.8

So, πr = 30.8/2

So, πr = 15.4

So, r = 15.4 ÷ (22/7)

So, r = 15.4 × (7/22)

So, r = 0.7 × 7

So, r = 4.9