Question

If the radius of a circle is 10 feet, what is the diameter?

Answer 1

its diameter will be 20 feet.

Answer 2

$r = radius \\ d = diameter \\ and \: \: d= r\times 2 \\ now \: here \\ r = 10feet \\ = > d = 2 \times 10 \\ = > d = 20feet$

here is ur ans hope it helps you.