A trapezoid may have zero or one pair of congruent sides.
A trapezoid normally has no congruent sides
Two of the end sides.
By definition, all trapezoids must have one pair of parallel sides. Therefore, an isosceles has one pair of congruent angles.
A parallelogram has two pairs of congruent sides.
A trapezoid has one pair of parallel sides.
2 pairs
One pair
A trapezoid normally has no congruent sides
The two outer sides
Two of the end sides.
By definition, all trapezoids must have one pair of parallel sides. Therefore, an isosceles has one pair of congruent angles.
A parallelogram has two pairs of congruent sides.
1 pair
2 pairs, the sides opposite each other are congruent to each other
A trapezoid has one pair of parallel sides.
Infinitely many.
2