what is heptagon and octagon?

7 sided polygon is called heptagon and 8 sided polygon is called octagon.

A seven sided figure is called a heptagon.

a eight sided figure is called a octagon.

Heptagon

This picture features a heptagon. A heptagon is apolygonwith 7 sides and 7 interior angles..Octagon

This picture features an octagon. An octagon is apolygonwith 8 sides and 8 interior angles which add to 1080 degrees.