Question

x^2+y^2+6x-18y+65=0 I need to find the radius ?

Answer 1

(-g, -f)
g= half coefficient of x
f= half coefficient of y

Answer 2

\[x^2+6x+y^2-18y=-65\]
\[(x+3)^2+(y-9)^2=-65+3^2+9^2=25\]
center is (-3,9) radius is 5

Answer 3

is the centre
r = sqrt(g^2+f^2-c)

Answer 4

g=3
f=-9
c=65
R= sqrt(9+81-65)=5

Answer 5

Thank you