A decagon has 35 diagonals. This can be computed by multiplying ten by seven and dividing by two. Seven is derived from the number of sides minus three.
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Its not a do-decagon its a dodecahedran!!
There are 1440 degrees in a decagon.
A decagon has 10 sides.
A decagon has 10 vertices.
There are 8 triangles in a decagon