Polygons Questions

How many sides do a decagon have? 
A seven sided polygon is a 
The name given to any shape with 2 pairs of parallel sides. 
How many sides do a Nonagon have? 
The name of any sixsided polygon. 
A six sided polygon is a 
How many sides do a heptagon have? 
A five sided polygon is a 
What word is used to describe line segments that meet at a right angle?