Question

which word approximately equals 3.14 and describes the ratio of the circumference of a circle to the length of its diameter?
radius
diameter
radical
pi

Explanation:

The ratio of the circumference of a circle to its diameter is defined as $\pi$, which is approximately 3.14. Radius is half of the diameter, diameter is a line through the center of a circle, and radical is related to roots in mathematics and not relevant here.

Answer:

D. pi