# 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.

## Point

Points are considered fundamental objects in Euclidean geometry.

## Line

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

### Lines of interest

 Lines Definition Piture Perpendicular lines Two lines intecsect at a point to form an angle 90o ${\displaystyle {\overline {AB}}\perp {\overline {CD}}}$ Parallell lines Two lines do not intecsect each other ${\displaystyle {\overline {AB}}{//}{\overline {CD}}}$ Vector Line with its direction ${\displaystyle {\vec {AB}}}$

## Angle

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 ${\displaystyle \angle }$ . Angle is measured in Degree(o) or Radian (Rad)

Example angle 90 degree is π radian

${\displaystyle \angle A=90^{o}={\frac {\pi }{2}}Rad}$

## Geometry Figure

### Polygon

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