The special case of a circle's area
A circle is a special case of an ellipse
. Analogous to the fact that a square is a kind of rectangle, a circle is a special case of an ellipse.
The formula for the area of a circle is Πr² . However, since a circle is an ellipse with equal
major and minor axes, the formula formula for the ellipse's are is equivalent to the formula for area of a circle.