Teacher’s notes
Names of polygons
3-sided		triangle
4-sided		quadrilateral
5-sided		pentagon
6-sided		hexagon
7-sided		heptagon
8-sided		octagon
9-sided		nonagon (also enneagon)
10-sided		decagon
11-sided		undecagon (also hendecagon)
12-sided		dodecagon	
20-sided		icosagon