A decagon has 10 sides
none
Its not a do-decagon its a dodecahedran!!
It depends on whether or not the decagon is a perfect decagon or a complex decagon. However, a perfect decagon has no acute angles.
There are 1440 degrees in a decagon.
A decagon has ten vertices.
A decagon has 10 sides
A decagon has 10 sides.
There are 8 triangles in a decagon
A decagon has 10 sides
A decagon has 10 vertices.
A ten sided decagon has 10 vertices
There are 10 sides on a decagon