The formula is: 0.5*(n2-3n) where n is the number of sides of the polygon.
So: 0.5*(81-27) = 27 diagonals
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A 9-sided polygon, is named 'Nonagon'. The number of diagonals are '9' From any one node, to the centre of the opposite side. Since there are 9 nodes and 9 lines, then there will be 9 diagonals.
277612920, but only if any number (including 9) can appear more than once.
It will probably depend on the dividend (the number to be divided)
-12 = x+9 x+9 -9 = -12 -9 x = -21
.999 repeating = 1So 1.0think of it as7/9 = .777...8/9 = .888...9/9 = .999... 9/9 = 1