Apothem
Given a Circle, the Perpendicular distance 
from the Midpoint of a Chord to the Circle'scenter is called the apothem. It is also equal to the Radius 
minus the Sagitta 
,
See also Chord, Radius, Sagitta, Sector, Segment
- Gyroelongated Pentagonal Birotunda
- Gyroelongated Pentagonal Cupola
- Gyroelongated Pentagonal Cupolarotunda
- Gyroelongated Pentagonal Pyramid
- Gyroelongated Pentagonal Rotunda
- Gyroelongated Pyramid
- Gyroelongated Rotunda
- Gyroelongated Square Bicupola
- Gyroelongated Square Cupola
- Gyroelongated Square Dipyramid
- Gyroelongated Square Pyramid
- Gyroelongated Triangular Bicupola
- Gyroelongated Triangular Cupola
- Gårding's Inequality
- Göbel's Sequence
- Gödel Number
- Gödel's Completeness Theorem
- Gödel's Incompleteness Theorem
- Haar Function
- Haar Integral
- Haar Measure
- Haar Transform
- Haberdasher's Problem
- Hadamard Design
- Hadamard Matrix