### Regular polygons

The shapes of the rooms in the Quest of 9 are based on regular polygons.

A polygon is a many-sided shape.

The shapes of the rooms in the Quest of 9 are based on regular polygons.

A polygon is a many-sided shape.

The common polygons are:

triangle ~ 3 sides

square ~ 4 sides

pentagon ~ 5 sides

hexagon ~ 6 sides

septagon ~ 7 sides

octagon ~ 8 sides

nonagon ~ 9 sides

decagon ~ 10 sides

Can you find out the names of 11 and 12 sided polygons?

A regular polygon has sides of equal length and equal internal angles.

The shapes below are both hexagons ~ one is regular and the other is irregular.