## anonymous one year ago @dumbcow

1. anonymous

2. dumbcow

oh ok, same formula...but now we have to move things around because we want the angle not the arc $arc = r* \frac{\text{\angle}}{180} \pi = (\frac{\pi r}{180}) \text{\angle}$ by multiplying by reciprocal we can get "angle" by itself $\text{\angle} = (\frac{180}{\pi r})*arc$

3. dumbcow

now try plugging in arc of 6pi, and r of 8 $Angle = \frac{180}{8\pi}* 6\pi$

4. anonymous

I get 135...

5. dumbcow

correct

6. anonymous

So it would be none of the above?

7. dumbcow

yep

8. anonymous

Thank you bunny much (: (\/) (. .) c(")(")

9. dumbcow

nice

10. anonymous

Are you good at finding the area of a circle? I've forgotten

11. dumbcow

yes $Area = \pi* r^2$

12. anonymous

Ok so it's giving me diameter... what's the formula then?

13. anonymous

@dumbcow ? :c

14. anonymous

Cause I tried just pi times the diameter and it wasn't right...

15. dumbcow

right pi * diameter will give you circumference you need to know how to convert diameter to radius ----> r = d/2 easy radius is half the diameter $A = \pi r^2 = \pi (\frac{d}{2})^2$

16. anonymous

When I fill it in my answer doesn't correlate with the answer options.

17. dumbcow

oh well thats because they want area of blue part, NOT the circle :) what did you get for circle?

18. anonymous

176.625

19. dumbcow

good ok you have to subtract this from area of square

20. anonymous

So how do I find that?

21. dumbcow

find area of square with side length of 15

22. anonymous

Okay, I got it. Thank you c:

23. dumbcow

np

24. anonymous

Would you help me with some more math stuff? lol

25. dumbcow

sure but i need to get off in 15 min or so

26. anonymous

Okay o: