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.
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A rhombus have 2 obtuse angles
There are 3 obtuse angles in a heptagon.
One and the two others are acute angles
one
Triangles do not have to have any obtuse angles but they can have one.