scalene triangle - a triangle with no congruent sides , equilateral triangle - a triangle with three congruent sides and three congruent angles , isosceles triangle - a triangle with two congruent sides and two congruent angles , square - a quadrilateral with four right angles and four congruent sides , rectangle - a quadrilateral with right angles and opposite sides that are equal and parallel, triangle - a polygon with three sides , trapezoid - a polygon that has at least one pair of opposite sides that are parallel, rhombus - a quadrilateral with four congruent sides , opposite sides that are parallel, equal opposite angles , two-dimensional - a polygon with length and width, parallel - lines that are the same distance apart and never touch, parallelogram - a quadrilateral that has congruent opposite sides, congruent - identical in form , polygon - a two-dimensional shape having three or more straight sides , pentagon - a five-sided polygon , hexagon - a six-sided polygon, heptagon - a seven-sided polygon , octagon - an eight-sided polygon,

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