Question

WHat is the diameter of a circle w/ a circumference that is 443 feet

Answer 1

Do you know the formula for circumference?

Answer 2

no

Answer 3

\[C=2\pi^2\]
Since we are given the circumference, we can plug that into the equation.

Answer 4

Circumference = diameter times pi

Answer 5

Hey @JackSmiley I think you made a mistake...

Answer 6

My apologies, I meant, \[2\pi(r^2)\]

Answer 7

okay what do i do

Answer 8

Since we know C, the equation would be:
\[443=2\pi(r^2)\]
From this, we can solve for r.

Answer 9

so 443/2

Answer 10

Yes, \[443/2=\pi(r^2)\]
Do you know what to do after this?

Answer 11

um is pi 3.14

Answer 12

Yes. :)
But most scientific calculators have a pi button, and it is better to use that instead of an estimate. :)

Answer 13

Wait i don't get that part the last part

Answer 14

Which part?

Answer 15

the pi(radius2)

Answer 16

Pi is a number, as 2 or any other integer, which means you can divide it as you would any other number, just as you did with the 2.

Answer 17

but how do i find radius

Answer 18

Radius squared, or r^2, can be solved for by taking the square root fo both sides, leavig you with \[r^2=(term)\] \[\sqrt{(term)}=r\]

Answer 19

wait how do i find radius though

Answer 20

Radius = r

Answer 21

\[443/2=\pi(r^2)\]\[443/(2\pi)=r^2\]\[r=\sqrt{443/(2\pi)}\]

Answer 22

hey @JackSmiley, you still got the formula wrong...