If the polar coordinates of the point ( x , y ) are ( r , θ ), determine the polar coordinates for the following points. (Use any variable or symbol stated above as necessary.)

a) -x,y
b)-2x,-2y
c)3x,-3y

I don't understand what they are asking for because i tried the r=sqrt(x^2+y^2) and that theta = tan^-1(y/x) and it was wrong.

Question

If the polar coordinates of the point ( x , y ) are ( r , θ ), determine the polar coordinates for the following points. (Use any variable or symbol stated above as necessary.)

a) -x,y
b)-2x,-2y
c)3x,-3y

I don't understand what they are asking for because i tried the r=sqrt(x^2+y^2) and that theta = tan^-1(y/x) and it was wrong.

anonymous · Answer

Well, for a) then r will stay the same, but theta will go to pi - theta.

anonymous · Answer

Think about it geometrically:|dw:1346004116066:dw| etc...