An isosceles triangle has 3 sides two of which are of equal lengths it also has 3 interior angles two of which are of equal sizes.
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An isosceles triangle has exactly two sides which are equal. (The word congruent usually applies to triangles, not sides.)
If it's an equilateral triangle then its 3 sides are congruent but if it's an isosceles triangle then only 2 of its sides are congruent
2 sides
Isosceles triangles have 2 sides that are equivalent and 2 angles that are congruent.
Equilateral, Isosceles and Scalene are three types of triangles classified based on how many congruent sides the triangle has.