anonymous
  • anonymous
Change from rectangular to cylindrical coordinates: (1,-2,1)--> (r,theta,z)
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
\[r=\sqrt{5}\]
anonymous
  • anonymous
z=1
anonymous
  • anonymous
but what is theta. I know you use ArcTan[-2/1]=Theta but I need the exact value

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amistre64
  • amistre64
isnt theta an xy plane rotation while the last one is an zy plane rotation? perse
amistre64
  • amistre64
theta = tan y/x
anonymous
  • anonymous
yeah but i get a decimal value I need it in Pi
amistre64
  • amistre64
arctan(-2) IS an "exact" value oh, then divide out the pi
anonymous
  • anonymous
yeah i know that, I just wasn't sure how to word what I am asking for. It is an internet based homework and when I enter ArcTan[-2] it is wrong and i don't think it wants the estimated value either cause it would have asked.
amistre64
  • amistre64
1pi = 3.14159... 1 = 3.14159... / pi
amistre64
  • amistre64
hmmm
anonymous
  • anonymous
yeah its odd. Is there another way to find the angle?
anonymous
  • anonymous
amistre64
  • amistre64
http://www.wolframalpha.com/input/?i=%28arctan%28-2%29%29*180%2Fpi another way? no. at least nothing that will give you a rational value
anonymous
  • anonymous
oh and the 14pi/4 was a crazy guess off terrible logic. ignore that.
amistre64
  • amistre64
arctan is gonna give you a value less then 0 so we would have to add 2pi to it to get a value between 0 and 2pi, for starters
anonymous
  • anonymous
oh hmm okay i could try ArcTan[-2]+2pi but I will be out of trys after this one.
amistre64
  • amistre64
|dw:1333053831067:dw|
anonymous
  • anonymous
Nice, it worked. Thanks. I should have paid attention to the question a little more.
amistre64
  • amistre64
:) good job

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