Question

Find the condition under which a general equation
of second degree in two variable represent a
circle.​

Answer 1

Answer:

ax2 + 2hxy + by2 + 2gx + 2fy + C = 0, where a, h, b, g, f and c are constants. Therefore, the general second degree equation in x and y represents a circle if coefficient of x2 (i.e., a) = coefficient of y2 (i.e., b) and coefficient of xy (i.e., h) = 0.