Question

Help!! Will give Medals!

Answer 1

This is arc length if I'm not mistaken?

Answer 2

Use this:
\[\frac{ n }{ 360 }*2\Pi r\]

Answer 3

n=degrees

r=radius

Answer 4

We are looking for the area of the shaded region, which is a third of the circle.
The area of a circle is
\[pir ^{2}\]

So just divide that area by 3 to find the area of the shaded region.

Answer 5

luigi's answer explains it better, but you end up with the same thing.

Answer 6

Oops, nevermind sorry

Answer 7

Oh, except it's pir^2 instead haha.

Answer 8

instead of 2pir :p

Answer 9

120/360 x 2 pi 8?

Answer 10

120/360 * pir^2

Answer 11

well actually the formula I looked up had 2pir

Answer 12

That is the formula for circumference of a circle. This question is asking for area of the shaded region.

Answer 13

That would solve the line XY if you used 120/360 * 2pir

Answer 14

Oops, yea sorry about that

Answer 15

= 67.05? @Luigi0210

Answer 16

well actually 134.04

Answer 17

It was 66.99 - 67.02

Answer 18

120/360 * pi(64) = 67.02

Answer 19

wait, it;s 2pi-134.04

Answer 20

r = 8
pi (r^2)
64pi

Answer 21

dang it.. sorry about that

Answer 22

Err, geometry was never my favorite..