anonymous
  • anonymous
find the length of the radius of circle c. http://media.education2020.com/evresources/2092539_2f57b746-c73f-4a4b-8c7e-ce9ee207b927.png
Geometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
A. r=1 B. r=3 C. r=12 D. r=15
anonymous
  • anonymous
@dan815
anonymous
  • anonymous
@DanJS

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dan815
  • dan815
okay that angle you see is actually in radians
dan815
  • dan815
when they say 4/9 pi they really mean 4/9 pi radius is our angle
dan815
  • dan815
that means this angle you see subtends a total of 4/9 pi radius units on the circumference of the circle
dan815
  • dan815
\[\frac{4}{9}\pi * r =\frac{20}{3} \pi \]\
anonymous
  • anonymous
ohh
dan815
  • dan815
yep :) so what is r
anonymous
  • anonymous
so it would be r=15
dan815
  • dan815
yep
anonymous
  • anonymous
Thank you soo much
DanJS
  • DanJS
arc length = radius* theta
anonymous
  • anonymous
:)
dan815
  • dan815
dont let radians confuse you, its a very simple idea, we are saying the angle in terms of the radius units thats why there are 2pi radians in a circle beacuse the circumference of a circle is 2 pi r
anonymous
  • anonymous
ok thank you.:)
dan815
  • dan815
welcome
DanJS
  • DanJS
yeah , i was looking for a easy explination that @dan815 just said... http://www.themathpage.com/atrig/arc-length.htm

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