barrelracer23
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 .



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barrelracer23
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thomasj
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lenght of what?

barrelracer23
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oh sorry, length of arc XPY

thomasj
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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?

barrelracer23
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I have to leave it in terms of (pi) im not sure how to do that

thomasj
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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)=?

barrelracer23
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So my answer choices are
540(pi) 9(pi) 18(pi) and 3(pi) would it be 9(pi)?

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

barrelracer23
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oh:\ Thank you for helping!

barrelracer23
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It said that the correct answer was 9(pi)?:\

alreadyalright
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Yes! 9 pi