When it's a right triangle and it's sitting on one of the congruent sides.
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No because only 2 of its 3 sides are congruent in an isosceles triangle but all 3 sides of an equilateral triangle are congruent.
An isosceles triangle has two congruent sides.
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 exactly two sides which are equal. (The word congruent usually applies to triangles, not sides.)
An isosceles triangle