নিচের কোনটি উপবৃত্তটির সমীকরণ? 

$\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1$ উপবৃত্ত; $a=b$ হলে নিয়ামকের সমীকরণ-

The eccentricity of an ellipse, with its centre at the origin, is$\frac{1}{2}$. If one of the directrices is x = 4, then the equation of the ellipse is

The equation of the ellipse with axes along the x-axis and the y-axis, which passes through the points P(4, 3) and Q (6, 2) is

Axes are coordinates axes, the ellipse passes through the points where the straight line $\dfrac {x}{4}+\dfrac {y}{3}=1$  meets the coordinates axes. Then equation of the ellipses is