3. They must added together equal 180 degrees.
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No, An equilateral triangle has 3 congruent angles, an isosceles triangle has 2 congruent angles, a scalene triangle has no congruent angles.
A triangle has no right angles when it is not a right angle triangle as for example as in the case of an equilateral triangle that has 3 equal 60 degree angles.
no triangle do not have four congruent angles
A right angles triangle, as one of the angles in the triangle is 90 degrees.
An obtuse triangle can have no right angles, and has two equal angles.