They all add up to 180 degrees.
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A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
Yes, an obtuse triangle can have two congruent angles, where for the obtuse angle measuring A degrees, each of the two other angles measures (180-A)/2.
The base angles of an isosceles triangle are the two angles that are equal to each other. They can be between 89.999...o and 0.000000..01o.
An isosceles triangle can have 1 right angle providing that the other 2 angles each measure 45 degrees.
A right triangle is a triangle in which one of the three angles measures 90°. In other words, it is a triangle with two sides that are perpendicular to each other.