an arrowhead has 4 angles. but no, you can't make an arrowhead out of only right angles.
No
There are some that would probably be within the 10th of a degree but none are exactly the same.
yes
An arrowhead perhaps
an arrowhead has 4 angles. but no, you can't make an arrowhead out of only right angles.
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.
No
The arrowhead has zero right angles.
It has one pair of opposite angles that are equal but not two.
The 'classic' arrow-head shape has 7 angles.
360 degrees
There are some that would probably be within the 10th of a degree but none are exactly the same.
yes
only if it is an equilateral triangle
Two or three.
An arrowhead perhaps