The 'classic' arrow-head shape has 7 angles.
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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.
An arrowhead is a quadrilateral and in common with all quadrilaterals its 4 interior angles add up to 360 degrees.
360 degrees
No but as a 4 sided quadrilateral its 4 interior angles add up to 360 degrees
All apart from square, rhombus, kite and arrowhead.