Radius is the distance from the center of the circle to the outer edge. This is not to be confused with the diameter, which is the length across a circle. The radius is always one half the diameter. The circumference is the perimeter of a circle, or the distance around the outside of it.

Question

A circle’s diameter is always ________ the length of its radius.

A
one half

B
twice

C
one third

D
equal to

Answer 1

B. twice