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Mathematics
Which of the following is the equation of a circle?
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Q. Which of the following is the equation of a circle?
Conic Sections
A
$x^2+2 y^2-x+6=0$
B
$x^2-y^2+x+y+1=0$
C
$x^2+y^2+x y+1=0$
D
$3\left(x^2+y^2\right)+5 x+1=0$
Solution:
In fourth option coefficient of $x^2=$ coefficient of $y^2$ and coefficient of $x y=0 \& \Delta \neq 0$