Function to find equation of ellipse .
static void equation_ellipse ( float x1 , float y1 , float a , float b , float c , float e ) { float t = a * a + b * b ; float a1 = t - e * ( a * a ) ; float b1 = t - e * ( b * b ) ; float c1 = ( - 2 * t * x1 ) - ( 2 * e * c * a ) ; float d1 = ( - 2 * t * y1 ) - ( 2 * e * c * b ) ; float e1 = - 2 * e * a * b ; float f1 = ( - e * c * c ) + ( t * x1 * x1 ) + ( t * y1 * y1 ) ; System . Console . WriteLine ( " Equation ▁ of ▁ ellipse ▁ is ▁ " ) ; System . Console . WriteLine ( a1 + " ▁ x ^ 2 ▁ + ▁ " + b1 + " ▁ y ^ 2 ▁ + ▁ " + c1 + " ▁ x ▁ + ▁ " + d1 + " ▁ y ▁ + ▁ " + e1 + " ▁ xy ▁ + ▁ " + f1 + " ▁ = ▁ 0" ) ; }