Find the parametric representation of the circle `x^2 + y^2 - 2x - 4y - 4 = 0`.

Find the parametric representation of the following circle x^2 + y^2+2x-4y-1=0 .

Find the parametric representation of the following circle x^2 + y^2=9 .

Find the parametric representation of the following circle 3x^2 + 3y^2=4 .

Find the parametric representation of the following circle x^2 + y^2+2gx +2fy+c =0 .

Find the parametric equation of the circles : 2x^2 + 2y^2-5x-7y-3=0 .

Find the parametric equation of the circles : 3x^2 + 3y^2+4x-6y-4=0 .

Find the parametric representation of the following circle (x-2)^2+(y-3)^2 =5 .

Find the parametric form of the equation of the circle x^2+y^2+p x+p y=0.

Find the equation of the circle passing through the points of intersection of the circles x^2 + y^2 - 2x - 4y - 4 = 0 and x^2 + y^2 - 10x - 12y +40 = 0 and whose radius is 4.

Find the area of the semi-portion of the circle x^2+y^2=4