Question

the ratio of the circumference to the diameter of any circle is known as ____. the approximate value of π (pi) is __. a circle’s diameter is twice the length of its __. the distance around the edge of a circle is called its __. the longest distance across a circle, passing through the center, is called the __. the distance from the center of a circle to any point on its edge is the ____.

Explanation:

1. The ratio of the circumference to the diameter of any circle is known as ______.

By definition, the ratio of a circle's circumference ($C$) to its diameter ($d$) is a constant named pi ($\pi$), so this blank should be filled with "pi".

The commonly used approximate value of $\pi$ for calculations is 3.14 (or more precisely 22/7 in some cases, but 3.14 is the most basic approximation taught initially), so we fill in 3.14.

The radius ($r$) of a circle is the distance from the center to the edge, and the diameter ($d$) is the distance across the circle through the center. The formula $d = 2r$ shows that the diameter is twice the radius, so this blank is "radius".

Answer:

pi

2. The approximate value of $\boldsymbol{\pi}$ (pi) is ______.