Question

The circumference of a planet is about 23,000 miles. Find its diameter to the nearest mile.

Answer 1

Circumference = $\pi d$

We know that the circumference in here is equal to 23000 miles. 

23000 = pi x d 

pi will be approximated to 3.14 

23000 = 3.14d 

divide both sides by 3.14 to get 
about 7325 as the diameter 

Answer 2

Circumference=$\pi D$
23000=3.142D
D=$\frac{23000}{3.142}$
D=7320.17
D=7320 miles