Question

The radius of a circle is 1 kilometer. What is the diameter?
r=1 km

Answer 1

The diameter is 2 km.

Explanation:

Diameter = radius * 2.

Answer 2

d = 2 km

Explanation:

The diameter is twice the radius

d= 2r

We know the radius is 1 km

d = 2* 1 km

d = 2 km