No
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an arrowhead has 4 angles. but no, you can't make an arrowhead out of only right angles.
It can have at most one obtuse angle.
Possibly in the form of an arrowhead providing that its 4 interior angles add up to 360 degrees
Yes. Two obtuse angles, of equal measure.Yes. Two obtuse angles, of equal measure.Yes. Two obtuse angles, of equal measure.Yes. Two obtuse angles, of equal measure.
Because they are obtuse angles!