Cartesian coordinates

  • Thread starter tatiana
  • Start date
  • #1
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Main Question or Discussion Point

We learned about cartesian coordinates briefly in class and i didnt completely understand them. Im not looking for an answer but rather the process on how to get to an answer in cartesian coordinates, for instance, in this example:


A point on a polar coordinate system is located at r=2.0 and = 25 degrees.


& then how you would use the Pythagorean Theorem to verify your answer?
 

Answers and Replies

  • #2
You need to use sines and cosines to find the corresponding x and y.

Then r is always the hypotenuse so you can plug it into the Pythagorean Theorem with the x and y you just found: x^2 + y^2 = r^2.
 
  • #3
mathman
Science Advisor
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In general if you are given something in polar coordinates (r,a) then x=rcos(a) and y=rsin(a).
 

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