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polygons click to hear : polygons

Geometric plane figures with several sides and a number of equal angles.
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trapezoid rectangle square rhombus triangle

trapezoid click to hear : trapezoid

Quadrilateral with two sides (bases) that are parallel. It is isosceles when it has two sides that are not parallel and equal, and rectangle when two of its sides form a right angle.

rectangle click to hear : rectangle

Quadrilateral whose opposite sides are equal in length; the sides meet at right angles.

square click to hear : square

Equilateral rectangle with four right angles.

rhombus click to hear : rhombus

Equilateral parallelogram.

triangle click to hear : triangle

Three-sided polygon; triangles are scalene (no side is equal to any other) isosceles (two sides equal) or equilateral (all sides equal).