## hexa-The Greek suffix hexa- means "six." A hexagon is a six-sided polygon. A hexahedron is
a six-sided polyhedron, otherwise known
as a cube if it is regular. Hexadecimal is the number system with base 16
(i.e., six more than decimal system) and is used mostly in computing (because
four binary digits can represent 16 different numbers). Hexagonal
numbers are figurate numbers (numbers that can be represented by a regular geometric arrangement of equally
spaced points) of the form n(2n - 1); the first few are
1, 6, 15, 28, 45, ... For hexaflexagon see flexagon.
For hexomino see polyomino. ## Related entry• Giant's Causeway## Related category• NOTABLE NUMBERS | |||||

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