a round shape
We arranged the chairs in a circle.

the appearance of a person or thing
Three shapes are on the hill.

to rest in a position where one's bottom is on a flat surface, such as a chair or the floor, with the top of the body remaining up; to get into a position with one's bottom is on a flat surface
One day, a fisherman sat down by a river and he began to fish.

a shape that has four straight sides that are all the same length, like a box
The house is a square.

the number 3
There are three girls.

a closed shape with three straight sides
The tree is a triangle.