A scalene triangle is a triangle in which all three sides and all three angles are different.
Therefore two angles of a scalene triangle are NEVER congruent.
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"Congruent" means "same shape and size as the other one". So one thing all by itself is never congruent. It needs something else to be congruent with. An isosceles triangle is never congruent to a scalene triangle, sometimes congruent to any other kind of triangle, and always congruent to another isosceles triangle that's congruent to the first one.
They have 2 congruent sides.
Never
Sometimes. "Scalene" simply means that the three sides have different lengths. This does not imply that the triangle has to have an obtuse angle.
A triangle with no equal sides or angles will always be classified as 'scalene'.