A quadrilateral because it has 4 sides.
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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.
Yes.Yes.Yes.Yes.
An arrow can have both concave and convex surfaces, depending in its design.
The 'classic' arrow-head shape has 7 angles.