Yes.
Yes.
Yes.
Yes.
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It depends on they type of arrowhead you have. If it is a arrowhead in the shape of a directional arrow, there are no obtuse angles. The most possible obtuse angles is 1.
It can do but that is not a requirement.
it's a 12 sided shape and it has 54 diagonals :D
There are: 0.5*(10002-3000) = 498,500 diagonals
A quadrilateral because it has 4 sides.