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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.
If 2 angles are congruent and complementary, they must each be 45 degrees.
They have obtuse angles on each side.
None because it has 2 equal obtuse angles and 2 equal acute angles but its diagonals intersect each other at right angles
6 obtuse angles, 120* each 6 Reflex angles, 240* each