My small dictionary of mathematics

1.Area
The area of square can be find with multiply length and wide.
2.Central angle
Central angle of perpendicular line is 90 degree.
3.Diameter
To find circumference of circle,we need diameter.
4.Rhombus
Rhombus is a kinds of square.
5.Prime number
11,37,59,73 are called prime number.
6.Intersect
Two line was intersect in one point.
7.Cube
A cube have six side.
8.Tangen
If in one point,there are only one or two tangen of circle.
9.Natural mathematics
Addition,substraction are kinds of natural mathematics
10.Volume
To find volume of cube we must multiply length,wide and altitude.
11.Toast
12.Concave