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Parallelogram

a quadrialteral with two pairs of opposites sides parallel

Rhombus

a parallelogram with four congruent sides

Square

a parallelogram with four congruent sides and four right angles

Rectangle

a parallelogram with four right angles

Trapezoid

a quadrilateral with exactly one pair of parallel sides

Isosceles trapezoid

a quadrilateral with exactly one pair of parallel sides and congruent legs

Isosceles triangle

a polygon with three sides that has two congruent sides

Equilateral triangle

a polygon with three sides that has three congruent sides

Scalene triangle

a polygon with three sides that has no congruent sides