Question

Suppose that you needed to make a pen for some small animals. you have 12 m of fencing. you decide to make a circular pen, because if you wish to enclose an area using a given length of fencing, then a circular fence encloses a larger area than a fence of any other shape. what is the radius r of the pen?

Answer 1

The 12 m of fencing s equal to the circumference of the circle.

If the radius is r, then the circumference is
2πr = 12
r = 12/(2π) = 6/π = 1.91 m

Answer: r = 6/π m or 1.91 m (nearest hundredth)