Question

The circumference of the Earth is approximately 25,000 miles. Find the diameter of the Earth.

Answer 1

The circumference of a circle is expressed as:

Circumference = 2 x pi x r

where r is the radius of the circle and is equal to half of the diameter.

25000 miles = 2 x 3.14 x r
r = 3980.89 miles
r = 7961. 8 miles

The best answer from the choices is B.

Answer 2

C= $\pi d$ 

25000/ $\pi$
= b