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 a circle's circumference to its diameter is a well - known mathematical constant. The symbol for this constant is $\pi$, which is approximately equal to 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, none of which fit the description.

Answer:

pi