anonymous
  • anonymous
CAN SOMEONE PLEASEEE HELP ME?!?!?!?!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
with?
anonymous
  • anonymous
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anonymous
  • anonymous
Sorry, i thought i posted it.

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anonymous
  • anonymous
15 pi
anonymous
  • anonymous
It is asking for the length of the 270 degree arc.
anonymous
  • anonymous
oh i am sorry, its xpy, i just saw that, good stuff
anonymous
  • anonymous
how did you get that?
anonymous
  • anonymous
Circumference = 2*pi*radius = 20*pi. Arc mentioned is 3/4th of the circumference = 15*pi.
Directrix
  • Directrix
This problem has to do with the circumference of a circle and a portion of that circumference thought of as "arc length." Note that the arc length you seek is not the one cut off by the central angle of 90 (minor arc XY) but the length of the major arc XPY. The degree measure for that major arc is 270 degrees (360 - 90) where 90 is the minor arc. Set up a proportion: 270 is to 360 as AL is to 2 pi r where AL represents the arc length you want. Notice that 2 pi r is the circumference of the circle. This problem is similar to one of exchanging one type of currency for another. 270 / 360 = AL / (2 pi r) 3 / 4 = AL / (2 pi *10) 3 / 4 = AL / (20 pi) AL = 15 pi

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