# Three quarter circle problem...

• Feb 16th 2013, 04:20 PM
evilgummybear
Three quarter circle problem...
My first post! I do have a question about three quarters of a circle perimeter question. It said the perimeter is 572. How do you separate the straight edges? What is the solution? Thanks for all your help! (Nod)
• Feb 17th 2013, 10:29 PM
earboth
Re: Three quarter circle problem...
Quote:

Originally Posted by evilgummybear
My first post! I do have a question about three quarters of a circle perimeter question. It said the perimeter is 572. How do you separate the straight edges? What is the solution? Thanks for all your help! (Nod)

1. Draw a sketch (or use a pizza and eat one quarter of it :D )

2. The perimeter of three quarters of a circle consists of 2 radii and the corresponding arc which is 3/4 of the perimeter of a circle.
Thus you have:

$2r + \frac34 \cdot 2\pi \cdot r = 572$

Solve for r.

3. You should come out with $r \approx 85.22$