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There are three types of triangles. Scalene triangles have no congruent sides or angles, equilateral triangles have 3 congruent sides and 3 60degree angles, and isosceles triangles have two congruent sides and two congruent angles.
Only if the congruent angle is the angle between the two congruent sides (SAS postulate).
An Isosceles triangle has two sides (and two angles) congruent.
They are congruent triangles.
No. All corresponding sides and angles have to be congruent for the triangles to be congruent.