polygons [1]![click to hear](/images/speaker.jpg)
Geometric plane figures with several sides and a number of equal angles.
trapezoid ![click to hear](/images/speaker.jpg)
Quadrilateral with two sides (bases) that are parallel. It is isosceles when it has two sides that are equal and not parallel, and rectangle when two of its sides form a right angle.
rectangle ![click to hear](/images/speaker.jpg)
Quadrilateral whose opposite sides are equal in length; the sides meet at right angles.
square ![click to hear](/images/speaker.jpg)
Equilateral rectangle with four right angles.
rhombus ![click to hear](/images/speaker.jpg)
Equilateral parallelogram.
triangle ![click to hear](/images/speaker.jpg)
Three-sided polygon; triangles are scalene (no side is equal to any other) isosceles (two sides equal) or equilateral (all sides equal).