Supplementary angles.
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45 degrees. they have to be the same angle, because they are opposite equal lengths, and when added together they must equal 90, so as to make the total of the angles 180.
There are 2 pairs and together they make 4 right angles in a square which also has a pair of perpendicular diagonals that intersect at right angles
Since the sum of the measures of the angles in a triangle is 180°, and a right angle has a measure of 90°, it follows that the other two angles together have a measure of 90°.
an arrowhead has 4 angles. but no, you can't make an arrowhead out of only right angles.
There can be 0 to 5 right angles, or 1 to 6 obtuse angles in a hexagon.