Question

Ive read this problem several times and I dont quiet understand.

You have 324 ft^2 of fabric to make a circular play parachute for kids. What is the radius of the largest parachute you can make? Round to the nearest tenth of a foot.

Answer 1

\[
\pi r^2 \leq 324\\
r^2 \leq \frac {324}\pi\\
r \leq \sqrt{ \frac {324}\pi }=\frac {18}{\sqrt\pi}
\]

Answer 2

\[
\frac{18}{\sqrt{\pi }}=10.1554
\]

Answer 3

Im not sure I understand

Answer 4

Can some one please elaborate?

Answer 5

A circular play parachute just looks like a huge circle when it's on the ground.
The area of a circle is (pi)(radius)^2. They're telling you the max area is 324 square feet.
pi (pronounced pie) is a number that equals 3.14159265.... It's a button on your calculator.
So now you have an equation with only one unknown, the radius.
Now look at elissaab's calculations.
The biggest parachute that you could make would have a radius of 10.155 feet.

Answer 6

It says to round to the nearest 10th of a foot, so your answer would be 10.2 feet.