Circle whose center is at the origin (0,0)
x² + y² = r² , where r is the radius of the circle
x² + y² = 49
[tex] \sqrt{(0) ^{2}+ (0) ^{2} } = \sqrt{49}
[/tex]
[tex] \sqrt{49} = 7, radius[/tex]
To graph this on coordinate plane:
From origin (0,0), the intersection of x and y axes, the coordinates are:
(7,0) (-7,0) (0, 7) and (0, -7)