Isosceles triangles have 2 sides that are equivalent and 2 angles that are congruent.
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An isosceles triangle has 3 sides and 2 of its sides are equal in lengths
An isosceles triangle has no parallel sides but it does have two equal sides
Two sides
An isosceles triangle has exactly two sides which are equal. (The word congruent usually applies to triangles, not sides.)
2 sides