# Radius of the base of a spherical cap

## Description

In geometry, a spherical cap or spherical dome is a portion of a sphere cut off by a plane.

Related formulas## Variables

a | Radius of the base of the cap (m) |

r | Radius of the sphere (m) |

h | Height of the cap ( 0 ≤ h ≤ 2r) (m) |