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# Mathematics

## Arithmetic

Arithmetic is a branch of math where basic operations are: addition, subtraction, multiplication and division, but also done in mathematical reasoning.

${\displaystyle 3+5=8}$ is an easy addition to kids of six years in kindergarden.

${\displaystyle 7391+3621=11012}$ is a medium addition to boys of eleven years in fifth grade.

### Substraction

${\displaystyle 9-4=5}$ is an easy substraction to kids of seven years in first grade.

${\displaystyle 50918-41715=9203}$ is a medium substraction to boys of eleven years in fifth grade.

### Multiplication

${\displaystyle 6*3=18}$ is an easy multiplication to boys of eight years in second grade.

${\displaystyle 342*31=10602}$ is a medium multiplication to boys of eleven years in fifth grade.

### Division

${\displaystyle 15/3=5}$ is an easy division to boys of nine years in third grade.

${\displaystyle 2187/81=27}$ is a medium division to boys of eleven years in fifth grade.

## Geometry

Geometry is a branch of math that studes the geometry forms.

### Trigonometry

Trigonometry is a branch of geometry that studies the triangle.

#### Sinus

The sinus is the opposite hick divided by the hypotenuse. The cosinus is the adjacent hick divided by the hypotenuse.

#### Tangent

The tangent is the opposite hick divided by the adjacent hick. The cotangent is the opposite reason of tangent.

#### Secant

The secant is the opposite reason of cosinus. The cosecant is the opposite reason of sinus.

### Angles

The triangle who the angles are 90°, 60° and 30°, the constants is: Adjacent hick to 60°: x. Adjacent hick to 30°: x*(rad.3) and the hypotenuse is 2x.

Four sides. The angles are alpha, beta, gamma and tit.

##### Square

Equal angles and equal sides.

##### Rhomboid

Two sides are equal and two angles are equal.

##### Diamond

A rhomboid who your upper angle is smaller than 90.

##### Rectangle

Equal angles and two equal sides.

##### Trapeze

Left and right sides are equal. Upper angles are equal and down angles are equal.

##### Trapezoid

No sides are equal.

 Mathematics Portal — All articles about mathematics.