octagon40.gifOctagon- An octagon got it's name by having eight edges. Another word for that is oct, so it's name is octagon.
hexagon40.gif Hexagon- A hexagon got it's name by the word hex which equals six edges, just like a hexagon.
pentagon40.gifPentagon- A pentagon got it's name by having five edges which equals pent.

square40.gif Square- A square got it's name by having four equal edges so it's a square.
tri40.gifTriangle- A triangle got it's name by having three edges which equals tri, so it's a triangle because it has an angle.