scalene - A triangle that has three unequal sides, right- angled - A triangle in which one angle is a right angle., quadrilateral - A flat shape with four straight sides., square - A plane figure with four equal straight sides and four right angles., rectangle - A quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular means that all of its angles are equal (360°/4 = 90°). It can also be defined as a parallelogram containing a right angle., parallelogram - A flat shape with 4 straight sides where opposite sides are parallel. Also: • opposite sides are equal in length, and. • opposite angles are equal, rhombus - A quadrilateral all of whose sides have the same length., trapezium - A quadrilateral with one pair of sides parallel., kite - A quadrilateral whose four sides can be grouped into two pairs of equal-length sides that are adjacent to each other., pentagon - Any five-sided polygon, hexagon - Any six-sided polygon, heptagon - Any seven-sided polygon, octagon - Any eight-sided polygon, nonagon - Any nine-sided polygon, decagon - Any ten-sided polygon,

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