quadrilateral
A Rhombus
A four-sided figure with two pairs of parallel sides the same length and four right angles is called a square.
A four sided figure with four equal sides and no right angles is a diamond, or a rhombus. If it had four right angles, it would be a square.
A quadrilateral
Trapezoid
A 12 sided figure is called a dodecagon.
parallelogram
A 5-sided figure is called a "Pentagon".
A 10 sided shape is a decagon
A ten sided figure is called a Decagon. ( i think that's how you spell it. )
A figure with four sides, two of which are parallel and with no right angles, is called a trapezoid (or trapezium in some countries). In this shape, the parallel sides are known as the bases, while the other two sides are called the legs. The angles between the legs and the bases can vary, which is why there are no right angles in this configuration.
A plane figure with a googol sides is called a googolgon.