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R=2cosθ Convert to rectangular form?

  • Thread starter Jurrasic
  • Start date
  • #1
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It does not explain it in any of the books ? So no clue even on how to start other than,
R = X squared + Y squared
 

Answers and Replies

  • #2
eumyang
Homework Helper
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It does not explain it in any of the books ? So no clue even on how to start other than,
R = X squared + Y squared
First of all this isn't correct. It should be
r2 = x2 + y2.

Second, if you have a textbook, check it again, because there are at least two other equations that can be used to convert polar equations:
x = r cos θ and y = r sin θ.

As for your problem,
r = 2 cos θ,
start by multiplying both sides by r. Then substitute.
 

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