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Earn +20 ptsQ: How many diagonals are in a 11- gon?
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What is the number of diagonals drawn from one vertex on a 13-gon?
There are 10 possible diagonals drawn from one vertex of the 13-gon which divide it into 11 nonoverlapping triangles.
How many diagonals are there in a 30- Gon?
There are: 0.5*(302-(3*30)) = 405 diagonals
How many diagonals in a 15 gon?
1/2*15*(15-3) = 90 diagonals.
How many diagonals does a 16 gon has?
104 16x ((16-3)/2) =104
What polygon has 209 diagonals?
22-gon
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