Question

The area of a round flat parachute is 380 square feet. Find the radius of the parachute.

Answer 1

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

Answer 2

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

Answer 3

\[\pi(r)^2\]

Answer 4

yes i know that

Answer 5

can you hold up for a sec

Answer 6

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

Answer 7

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

Answer 8

so the radius of the parachute is approximately 10.99