Which of the folloeing equation gives circle?

Options

A. `r=2 sin 0`
B. `r^(2) cos 20 =1`
C. `r(4 cos0 +5 sin0)=3`
D. `5=r(1+sqrt2 cos 0)`

Answer

A

Explanation

Now, taking option (a) `r=2sin 0`
` let `x=r cos 0, y=r sin 0 `therefore r^(2)=r2r sin 0 rArrx^(2)+y^(2)=2y` Which represents an equation of cricle .