# Fundamental Mathematics/Geometry

**Geometry** (from the Template:Lang-grc; *geo-* "earth", *-metron* "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. A mathematician who works in the field of geometry is called a geometer.

## Contents

## Point[edit]

Points are considered fundamental objects in Euclidean geometry.

## Line[edit]

By Eucleur axiom, line can be drawn from 2 points . Example through 2 points A and B , we can draw a line AB

- A---------------B

### Example of lines[edit]

### Lines of interest[edit]

**Lines****Definition****Piture**Perpendicular lines Two lines intecsect at a point to form an angle 90 ^{o}Parallell lines Two lines do not intecsect each other Vector Line with its direction

## Angle[edit]

Two lines intersect at a point to form an angle between 2 lines . Example Line AB intersects line AC to form an angle A between 2 lines . Angle has a symbol . Angle is measured in Degree(^{o}) or Radian (Rad)

Example angle 90 degree is π radian

Acute angle , angle less than 90°

Right angle , angle equals to 90° (1/4 vòng tròn);

Obstuse angle angle greater than 90° and less than 180°

Góc bẹt là góc 180° (1/2 vòng tròn).

Góc phản là góc lớn hơn 180° nhưng nhỏ hơn 360°

Góc đầy là góc bằng 360° (toàn bộ vòng tròn).

## Geometry Figure[edit]

### Polygon[edit]

Geometry figure is a figure of n sides include

**Geometry Figure****Definition****Types**Polygon Figure of n sides Triangle 3 sided polygon of Isosceles triangle | Right triangle | Equilateral Triangle Quadrilateral 4 sided polygon of Rectangle | Square | Parallelogram | Rhombus | Trapezoid