- a perpendicular from the center of a regular polygon to one of its sides.
Origin of apothem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for apothem
The "Apothem is a perpendicular from the vertex of a pyramid on a side of the base."
A peculiarity of this pyramid is, that base is to altitude as apothem is to half base.
In any pyramid, the apothem is to half the base as the area of the four sides is to the area of the base.
I have mentioned the above to show how very nearly these ratios agree with my exact ratio of 21 to 34 half base to apothem.
- the perpendicular line or distance from the centre of a regular polygon to any of its sides
C20: from apo- + Greek thema, from tithenai to place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012