# Calculus

how to convert this from rectangular to polar?

r=cos theta

1. 👍 0
2. 👎 0
3. 👁 39
asked by Josh
1. remember the formulas I gave you in your last post regarding this ?

r = √(x^2 + y^2) and x = rcosØ

so r = cosØ is
r = x/r
r^2 = x
x^2 + y^2 = x

which is the equation of a circle.

1. 👍 0
2. 👎 0
posted by Reiny

## Similar Questions

1. ### Calculus

I wanted to confirm that I solved these problems correctly (we had to convert the polar curves to Cartesian equations). 1.rcos(theta)=1 x=1 2.r=2*sin(theta)+2*cos(theta) r^2=2rsin(theta)+2rcos(theta) x^2+y^2=2y+2x (a little unsure

asked by Joshua on March 13, 2009
2. ### PRECALCULUS

convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

asked by YOSHI on April 16, 2011
3. ### PRECALCULUS HELP PLEASE!

convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

asked by YOSHI on April 16, 2011
4. ### precalculus

convert the equation y^2 = 2x -x^2 into polar form. convert the equation r = 2tan(theta) into rectangular form. I'm not really sure what either of these mean. I vaguely understand polar coordinates, but I'm not sure how to convert

asked by Annie on December 6, 2009
5. ### Calculus

Convert the polar equation to rectangular coordinates: r = 2-cos theta ...and find all points of vertical and horizontal tangency.

asked by Liz on April 16, 2013
6. ### Calculus

convert to polar: 2xy=3 A. r=sqrt(3sin theta cos theta) B. r=sqrt[(3sin theta cos theta)/2] C. r=[3/(2sin theta cos theta)] D.This cannot be converted without ambiguity.

asked by Sade on December 2, 2016
7. ### Math ! Please Help !

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write

asked by Becca on February 26, 2013
8. ### Calculus please help !

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write

asked by Becca on February 26, 2013
9. ### Pre-calculus; urgent ! Please help !

1.Graph the polar equation r=3-2sin(theta) 2. Find the polar coordinates of 6 radical 3,6 for r > 0. 3. Find the rectangular coordinates of (7, 30°). 4. Write the rectangular equation in polar form. (x – 4)2 + y2 = 16 5. Write

asked by Becca on February 26, 2013
10. ### precaculus

Convert the rectangular coordinate (2,-2) to polar form and find two additional representations of this point. Can you check my work and explain how to finish the question? r=√(2)2+(-2)2 r=2√2 tan theta = (-2)/2 theta = -1

asked by Anonymous on December 12, 2016

More Similar Questions