Wednesday

December 17, 2014

December 17, 2014

Posted by **Shane** on Sunday, September 1, 2013 at 2:01am.

- maths -
**Steve**, Sunday, September 1, 2013 at 1:12pmeh? r is the radius. r = √r^2

Not sure what you mean by "how is r given?" Its square is part of the equation, as are h and k.

For this particular circle, we have

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

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

(x+1)^2 + (y-1)^2 = 3

so, r = √3

**Answer this Question**

**Related Questions**

maths - A circle x^2 + y^ + 2x - 2y -1 = 0 expressed in the following form (x-h...

maths - the circle is given by the equation x^2+y^2+8x-7/2y=0 find (i)...

Maths - In polar coordinates, the parametric equations x=6+cos(f) and y=sin(f) ...

maths - the equation of the circle is x^2+y^2+2x-8y-1=0. Find the coordinates of...

Maths - In an orthonormal system, you're given the following: Point P(1,2) Lina ...

maths - The equation of the circle is x(squared)+y(squared)-3x -4=0.Find : (i)...

Trigonometry - 1) Find the coordinates of the point (-1,3) after the ...

Precal - The point (r,theta) in polar coordinates is (7,5) in rectangular ...

maths - the equation of the circle is x^2-8x+y^2+4y+11=0 find any coordinates ...

Maths - Let S be a set of 31 equally spaced points on a circle centered at O, ...