Find the standard form,

Thus a circle of radius 2 centered at (1,0)

Pretend you have a regular circle of radius 2 and you stech the horizontal by factor of 2 what happends? The ellipse will have a horizontal axis of 4 and vertical axis of 2. The the semi-horizontal and semi-vertical axes, respectively, are. 2,1. In that case the equation of the ellipse is,