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Yes. The two angles on either side of the reflex angle are normally equal.
An Arrowhead has got 1 line of symmetry so do NOT beleive what anyone else says!
yes an arrowhead has 4sides because it is a quadrilateral but it doesn't have any parallel sides
5 to be exact
4 angles and 4 vertices. It has at most 2 verticals. It has no verticles (whatever they might be!)