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Geometry

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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

Flickr Creative Commons Images

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