Circle

(Tune: London Bridge)

I'm as round as I can be,

I can be, I can be

I'm as round as I can be,

I'm a circle.

Square

(Tune:  London Bridge)

I've got four sides they're all the same,

all the same, all the same.

I've got four sides they're all the same,

I'm a square.

Triangle

(Tune:  London Bridge)

I've got three corners and three sides,

and three sides, and three sides.

I've got three corners and three sides,

I'm a triangle.

Rectangle

(Tune:  London Bridge)

I've got two sides long and two sides short,

Two sides short, two sides short.

I've got two sides long and two sides short,

I'm a rectangle.