trapezoid
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A trapezoid is a four-sided figure with only one pair of parallel sides. A square will always have two pairs of parallel sides.
rhombus
A parallelogram is defined as a two-dimensional figure with two pairs of parallel sides. Since a rectangle has two pairs of parallel sides, it is also a parallelogram. A rectangle differs from a parallelogram in that it always has four equal angles.
rhombus
An isosceles triangle. It has two pairs of equal sides, which are also not parallel.