Circumference

divided by diameter

give pi.

Pi times diameter

gives circumference.

3 sides,

3 angles,

It is the triangle.

4 sides

It has the quadrilateral.

5 sides

It has the pentagon.

6 sides

It has the hexagon.

7 sides

has the heptagon.

8 sides

It has the octagon.

9 sides

It has the eneagon.

10 sides

It has the decagon.

20 sides

It has the icosagon.

Multiplication,

potentiation

and division.

Square root

use division,

potentiation

uses multiplication.

Multiplication

It's the opposite

of division.

Division

It's the opposite

of multiplication.

Addition

It's the opposite

of subtraction.

Subtraction

It's the opposite

of the addition.

Subtraction,

root

and addition.

The m

from OBM

have multiplication,

potentiation

and addition.

It has division,

square root

and subtraction.

Maria Clara Cardoso