How_To_Be_Good_At_Math

GEOMETRY • NAMING POLYGONS 219

5 sides and

5 angles

4 sides and

4 angles

9 sides and

9 angles

8 sides and

8 angles

Regular nonagon

Regular quadrilateral Regular pentagon

Regular dodecagon

Regular octagon

Regular icosagon

Irregular
heptagon

Irregular

decagon

Irregular

nonagon

Irregular

pentagon

Irregular

quadrilateral

Irregular

dodecagon

Irregular

octagon

Irregular

icosagon

All the sides

and angles of a

regular polygon

are equal

An irregular

polygon has

sides and angles

that are not

equal

12 sides and

12 angles

20 sides and

20 angles

218_219_Naming_Polygons.indd 219 29/02/2016 18:04