no triangle do not have four congruent angles
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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.
The base angles of an isosceles triangle are congruent. The vertex angle of an isosceles triangle is not necessarily congruent to the base angles.
It will be either isosceles or equilateral. It is equilateral if all of the angles are congruent.
An equilateral triangle has 3 congruent angles that add up to 180 degrees.
An obtuse triangle must have two acute angles and these can be congruent.