What kind of polygon is this?

This octagonal table is very unique.

The police dog helped to find the criminal.

I use a pedometer every day to count my steps.

She is learning how to use adjectival nouns.

He is learning how to use adjectives.

He is considered to be a calculating person.

He tilted his neck to examine the jugular vein.

When the earthquake alarm went off, we evacuated immediately.

He installed a sundial in the garden.