Posted by **batmo** on Monday, September 17, 2012 at 3:55pm.

Write the polar equation in rectangular form. r = 12 sin theta

Write the rectangular equation (x + 7)^2 + y^2 = 49 in polar form

- Calculus -
**Steve**, Monday, September 17, 2012 at 3:58pm
r = 12 sinθ

r^2 = 12r sinθ

x^2+y^2 = 12x

x^2 - 12x + y^2 = 0

(x-6)^2 + y^2 = 36

This one is just the reverse process:

(x+7)^2 + y^2 = 49

x^2 + 14x + y^2 = 0

x^2 + y^2 = -14x

r^2 = -14r cosθ

r = -14 cosθ

- Calculus -
**batmo**, Monday, September 17, 2012 at 4:02pm
thank you!

- Calculus -- OOPS! -
**Steve**, Monday, September 17, 2012 at 4:09pm
I mixed up x and y in the 1st one!

x^2+y^2 = 12y

x^2 - 12y + y^2 = 0

x^2 + (y-6)^2 = 36

Also, the 2nd one could just as well have been written r = 14cosθ. It would just draw the circle from the left, rather than from the right.

## Answer this Question

## Related Questions

- Pre-calculus; urgent ! Please help ! - 1.Graph the polar equation r=3-2sin(theta...
- Calculus please help ! - 1.Graph the polar equation r=3-2sin(theta) 2. Find the ...
- Math ! Please Help ! - 1.Graph the polar equation r=3-2sin(theta) 2. Find the ...
- Pre-calculus HELP PLASE ! - 1.Write the rectangular equation in polar form. (x...
- Math HELP PLEASE! QUICK! - 1.Write the rectangular equation in polar form. (x – ...
- Polar to Rectangular Form - The letters r and theta represent polar coordinates...
- calculus - for what value of r=4sinč have vertical tangent? In polar coordinates...
- PRECALCULUS HELP PLEASE! - convert the polar equation to rectangular form. 1.) ...
- PRECALCULUS - convert the polar equation to rectangular form. 1.) r sec(theta...
- Pre-Calculus - Please check: 1.Find polar equation of x^2 + y^2 = 10y r^2 for x^...