180 degrees
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3. They must added together equal 180 degrees.
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.
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
An obtuse triangle can have no right angles, and has two equal angles.
Supplementary angles are two angles that, when added together, are equal to 180 degrees.