## anonymous 5 years ago Trying to figure out how to find the length of a polar curve eq - r=7sin(theta + Pi/4). I do not know how to do this HELP

1. bahrom7893

what is the equation? r = 7Sin(theta+Pi/4) or - r = 7Sin(theta+Pi/4) ?

2. anonymous

r=

3. bahrom7893

okay so..

4. bahrom7893

$Length = \int\limits_{a}^{b} \sqrt{r^2+(dr/d \theta)^2}d \theta$

5. bahrom7893

Now the hard part here is, finding the limits.. i forgot how to do that, let me graph this thing, see what it looks like..

6. bahrom7893

still tryin to figure out limits...

7. bahrom7893

do you know how to find limits? I've always been bad at polar stuff...

8. anonymous

no - this problem came from my College algebra/trig 400 class. Not doing integration yet.

9. bahrom7893

I think i know the limits, but sorry I can't solve this without integrating, never learned any other way of finding arclength..=(