Question

if the radius of the circle is x2 - y2 then find it's circumference​

Answer 1

Step-by-step explanation:

Circumstance of circle is 2πr.

2× π× x2-y2

2π× (x2-y2)

Answer 2

Step-by-step explanation:

The equation of the circle is given as 1+m2(x2+y2)−2cx−2mcy=0.

(x2+y2)−1+m22cx−1+m22mcy=0

Comparing the given equation with general equation of circle,

x2+y2+2gx+2fy+c=0

The center of circle is C=(−g,−f) and the radius of circle is r=g2+f2−c.

Therefore, from the given equation,

g=−1+m2c and f=−1+m2mc

C=(1+m2c,