Polygons

Polygons in geometry

Polygons in geometry are numerous. In geometry, the number of sides of polygons and the sum of interior angles of the polygons are important.

What is a polygon?

A polygon is a term used to describe triangles, trapezoids, pentagons, hexagons and octagons. A polygon is any shape with at least three sides. A triangle is the smallest polygon.

Types of polygons, polygon shapes and polygon names

Polygon names - polygons	number of sides	sum of interior angles of polygons (in degrees)
triangle	3	180
quadrilateral	4	360
square	4 equal and perpendicular	360
rectangle	4 perpendicular	360
rhombus	4 equal	360
parallelogram	4 opposite parallel	360
pentagon	5	900
hexagon	6	1080
heptgon	7	1260
octagon	8	1440
nonagon	9	1620
decagon	10	1800
ondecagon or hendecagon	11	1980
dodecagon	12	2160
icosagon	20	3600