Find the circumference of a circle with a radius of 5 cm.

A circle is a flat geometric figure whose points are equidistant from a given point, the center of the circle. The length of a circle is also called the perimeter of a circle.
Let’s write down the formula for determining the circumference in terms of the radius:
l = 2πR,
where l is the circumference, R is the radius, π = 3.14
Substitute the known values of R and π into the formula, find l:
l = 2 × 3.14 × 5 = 31.4 cm.
Answer: The circumference is 31.4 cm.