a triangle with 3 acute angles
a triangle with one obtuse angle
a triangle with 1 right angle
a triangle with three equal sides
a triangle with two congruent sides
a triangle with no congruent sides
a polygon with 4 sides
A quadrilateral with two pairs of parallel sides
a quadrilateral with exactly one pair of parallel sides
a parallelogram with 4 congruent sides
a parallelogram with four right angles
having four equal sides and four right angles or forming a right angle
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