## anonymous 5 years ago The area of a round flat parachute is 380 square feet. Find the radius of the parachute.

1. anonymous

ok so to find the area of a circle, we use the formula: $pir$ ryou know this, right?

2. anonymous

sorry, that was supposed to say pie(r)^2

3. anonymous

$\pi(r)^2$

4. anonymous

yes i know that

5. anonymous

can you hold up for a sec

6. anonymous

ok, so this is like an average algebraic problem, except this time we need to solve for r(the radius) so we set up this equation like this: π(r)^2 =380

7. anonymous

π(r)^2 =380 r^2=380/π r^2= 120.95775674984 (calculator) $r=\sqrt{120.957756}$ r=10.99 ( approximately)

8. anonymous

so the radius of the parachute is approximately 10.99