What is the circumference of a circle with radius of 30 inches?

Question

18838 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-05-29T13:15:39

#color(blue)(188.5 " inches")#

The circumference of a circle is given by:

#2pir#

Where #bbr# is the radius, and #bbpi# is the ratio of the circumference of a circle to its diameter.

We have radius #=30#

#:.#

#2(30)pi=60pi#

If #pi~~3.1416#

#2(30)(3.1416)=188.5#inches. 2 d.p.