Question

17. What's the circumference of a circle with a diameter of 30 centimeters?

Answer 1

30 multiplied by 3.14

Answer 2

Circumference of circle=2πr

Where r=radius

2r=d

d=diameter

So,2πr=πd

Note,π=227

In this statement,c=circumference

→c=πd

→c=π(30)

→c=π30=227(30)

→c=6607=94.28...

Circumference is 94.28...cms