Well, actually it has exactly three congruent sides.
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An isosceles triangle has exactly two sides which are equal. (The word congruent usually applies to triangles, not sides.)
An isosceles triangle
Scalene Triangle- a triangle with no congruent sides Isosceles Triangle- a triangle with two congruent sides Equilateral Triangle- a triangle with three congruent sides
An Isosceles triangle has two sides (and two angles) congruent.
Isosceles Triangle - 2 congruent sides Equilateral Triangle - all three sides are congruent Scalene triangle - no sides are congruent