Today is Pi Day! Pi is the ratio of a circle’s circumference to its …

A Diameter
B Radius
C Area

Fact: Pi (3.14159…) is a mathematical constant used in many areas of mathematics and physics. It is the ratio of a circle’s circumference to its diameter, and it can be used to find the area of a circle or the volume of a sphere, as well as in advanced mathematics such as vector calculus.

Correct Answer: Diameter