The arrowhead has zero right angles.
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Depends. Most of the time the angles are acute or obtuse
Yes.
A right angle is 90 degrees (90o).90
There are 90o in a right angle. A right angle is one-quarter of a full circle i.e. 360o.
there cant be two thirds of a right angle cause a right angle can only be 90 degrees ! if its not 90 degrees it is not a right angle it would be an acute angle !!!