6 and 8, but:
Hexa as in Hexa-Decimal mean 16 number system. ie: 0123456789ABCDEF : 16 digits. 10 decimal + 6 hexa.
Octa as in a numbersystem mean 8 number system. ie: 01234567 : 8 digits.
A Hexagon is a polygon with 6 sides.
An Octagon has got 8 sides.
Examples of numbers in these number systems:
10, 12, 14 =Decimal
A, C, E = HexaDecimal
12, 14, 16 = OctaDecimal
All representing the same number just in different systems.
Additional information:
We use the Decimal number system because it is by far the easiest to do calculations with. It has become a world wide standard.
We use HexaDecimal and Binary in computers.
Octa as in a number system has got no widespread uses as to my knowledge. It might be used in various coding schemes to make information less obviously visible.
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The prefix "hexa" means six, while "octa" means eight. These prefixes are commonly used in naming chemical compounds or geometric shapes based on the number of elements or sides they contain.
The Greek prefix for 6 is "hexa-".
The prefix for one sixth is "hexa-."
The prefix "octa-" means eight. In the case of "octagon," it refers to a polygon with eight sides.
The Greek prefix for 1 is "mono-," for 2 is "di-," for 3 is "tri-," for 4 is "tetra-," for 5 is "penta-," for 6 is "hexa-," for 7 is "hepta-," for 8 is "octa-," for 9 is "ennea-," and for 10 is "deca-."
The prefix of a hexagon is "hexa-."