Name:
Anonymous
2008-12-03 16:27
A circle has centre C (2,1) and radius 5. Show that the equation of the circle may be written as x^2+y^2-4x-2y-20=0.
Name:
Anonymous
2008-12-03 19:03
otherwise, write the equation for a circle with centre 2,1 and radius 5 and expand to get the same shit.
(x-2)^2 + (y-1)^2 = 25
x^2 - 4x + 4 + y^2 - 2y + 1 = 25
x^2 + y^2 - 4x - 2y - 20 = 0
e-z p-z.