Question

A circular rug has a radius of 2.5 feet. You want to sew fringe border around the rug. How many feet of fringe do you need to buy? Use straight pi= 3.14 and round to one decimal place.

Answer 1

Since we need to sew the border of the rug, we need to find its perimeter.

The perimeter of a circle is given by the next formula

$\begin{gathered} P_{\text{circle}}=2\pi r \\ \text{where} \\ \pi=3.14 \end{gathered}$

There, r is the radius of the circle

Then, in our particular case, r=2.5ft.

$\Rightarrow P=2\pi\cdot(2.5)ft=2\cdot3.14\cdot2.5ft=15.7ft$

And this result is already rounded to one decimal place.

In conclusion, we will need 15.7ft of fringe to perform the task