At least 2. (If all 3 sides are congruent it's equallateral, but can still be called isoceles)
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A trapezoid may have zero or one pair of congruent sides.
A trapezoid normally has no congruent sides
Two of the end sides.
Many things have 2 sides that are congruent, including isoceles triangles, any regular polygons or polyhedrons, rectangles, etc.
It has to have at least 2 congruent angles and/or sides to be isosceles. Therefore, an equilateral angle would be isosceles.