Question

Find the center and radius of each.

1- x^2+y^2=49
2- x^2+y^2=324
3- x^2+(y+2)^2=121
4- (x+10)^2+(y+9)^2=8

Answer 1

x^2+y^2=49

Radius 7
Center (0,0)

x^2+y^2=324

Radius 18
Center (0,0)

x^2+(y+2)^2=121

Radius 11
Center (0, -2)

(x+10)^2+(y+9)^2=8

Radius 2√2≈2.82843
Center (-10, -9)