Geometry & Trigonometry
Basic

Area of an Ellipse

Area enclosed by an ellipse.

Formula

A=πabA = \pi a b

Variables

aSemi-major axis
bSemi-minor axis

Example

Semi-axes a=5, b=3: A = π·5·3 ≈ 47.1 square units.

Did You Know?

An ellipse's area is πab — collapse it to a circle (a=b=r) and it becomes the familiar πr².

ellipsearea