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February 28, 2015

February 28, 2015

Posted by **Kate** on Thursday, May 16, 2013 at 11:29am.

4. Transform each polar equation to an equation in rectangular coordinates and identify its shape.

a. r = 6

b. r = 2cosθ

Answer:

- TRIGONOMETRY -
**Steve**, Thursday, May 16, 2013 at 11:56amr=6 is just a circle of radius 6

x^2+y^2 = r^2

This is also a circle, but shifted along the x-axis:

r = 2cosθ

r^2 = 2rcosθ

x^2+y^2 = 2x

x^2-2x+1 + y^2 = 1

(x-1)^2 + y^2 = 1

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