a b. a The circle is simply an ellipse where = The equation of a circle of radius and centre x2) (x1, is The equations for an ellipse and circle centred on the origin (0, 0) are ellipse circle a b a b, a For the ellipse, is best refer to as the X radius and as the Y radius. When > is b often called the semi-major axis and is called the semi-minor axis. As seen from the equation and graph of an ellipse it is a multi-valued function. For each x y value of there are two values. The equation for an ellipse with can also be given in parametric form where is an angle which ranges from 0 to radians. The equation of a circle in parametric form with the center at the origin (0,0) and radius a is
The circle is simply an ellipse where a = b. The equation of a circle of radius a and centre (x1, x2) is The equations for an ellipse and circle centred on the origin (0, 0) are ellipse circle For the ellipse, a is best refer to as the X radius and b as the Y radius. When a > b, a is often called the semi-major axis and b is called the semi-minor axis. As seen from the equation and graph of an ellipse it is a multi-valued function. For each value of x there are two y values. The equation for an ellipse with can also be given in parametric form where is an angle which ranges from 0 to radians. The equation of a circle in parametric form with the center at the origin (0,0) and radius a is
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