Could someone tell me how to do this problem? I will post the photo in the comments..
Find the length of . Leave your answer in terms of .

Question

Could someone tell me how to do this problem?  I will post the photo in the comments..
Find the length of  . Leave your answer in terms of  .

anonymous · Answer

attachment

anonymous · Answer

lenght of what?

anonymous · Answer

oh sorry, length of arc XPY

anonymous · Answer

length of arc xy is equal to the measure of the right central angle =90
total arc length for a circle is 360.
can you do it from here?

anonymous · Answer

I have to leave it in terms of (pi) im not sure how to do that

anonymous · Answer

ok. total arc length of circle in  terms of pi is 2pi. the 90 degree arc is 1/4 of the total circle arc. 
so 1/4(2pi)=?

anonymous · Answer

So my answer choices are 
540(pi)    9(pi)    18(pi)   and 3(pi) would it be 9(pi)?

anonymous · Answer

none of those works. the answer would be 3pi/2

anonymous · Answer

oh:\ Thank you for helping!

anonymous · Answer

It said that the correct answer was 9(pi)?:\

alreadyalright · Answer

Yes! 9 pi