0.5*(162-48) = 104 diagonals
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If you mean "How many diagonals can be drawn from one vertex of a figure with 16 sides", the formula is n-3, where "n" being the number of sides of the figure. So 16-3 = 13 diagonals that can be drawn from one vertex.
A 16-sided figure is called a hexadecagon. Another name for this polygon is a hexakaidecagon.This polygon also has 16 vertices.
Using the formula 0.5(n^2 -3n) whereas n is number of sides, altogether there are 104 diagonals in a 16 sided polygon
A 16 sided figure, really depends on what kind of figure it is. But the prefix for 16 would be hexadeca-, so if it was a polygon with 16 sides and 16 vertices it would be a hexadecagon (or hexakaidecagon). The conjunction -kai- is used by the Greeks in numbers that are from 13-19 (or all the teen, ex. thirTEEN, fourTEEN). The English numerical system have dropped the -kai- conjunction.
104 16x ((16-3)/2) =104