1. Polygon means “many angles”
(derived from the Greek poly, meaning "many," and gonia, meaning "angle“)
means “many angles”
A 3-sided polygon is a …
triangle
A 4-sided polygon is a …
quadrilateral
A 5-sided polygon is a …
pentagon
A 6-sided polygon is a …
hexagon
A 7-sided polygon is a …
heptagon
An 8-sided polygon is an …
octagon

2. A quadrilateral has 4 sides These are some special quadrilaterals
Square
Rectangle
Parallelogram
Rhombus
4 equal sides
4 right angles
Opposite sides equal
4 right angles
Opposite sides equal and parallel
A parallelogram with 4 equal sides
Trapezium
Kite
Arrowhead (delta)
1 pair of opposite sides parallel
2 pairs of adjacent sides equal
1 pair of equal angles
2 pairs of adjacent sides equal
1 pair of equal angles
1 reflex angle

3. all its sides equal and all its angles equal
A regular polygon has
all its sides equal and all its angles equal
Regular
Pentagon
Irregular
Pentagon
Regular
Octagon
Irregular
Octagon