# Circumference of an Ellipse - h component

## Description

The quantity h = (a-b)2/(a+b)2 is often used in elliptical circumference calculations e.g in Ramanujan formula for the Circumference of an Ellipse.

Related formulas## Variables

h | Circumference of an Ellipse - h component (dimensionless) |

a | length of the semi-major axis (m) |

b | length of the semi-minor axis (m) |