BASIC GEOMETRY CONCEPS AND DEFINITIONS

Geometry: It is an area of know which studies any elements and operations. It comes from greek, geo-carch and metry- measurement.

Point: can be defined as the place or location where two lines intersect.
Line: are many point, but very together.

Ray: a line which begins at a particular paint.
Midpont: it is the point that is halfway between endepoints of the line segment.
Endpint:  is a point at which a line segment or a ray ends or starts
Line segment: it is a line with two endpoints
Length: measurament of something from end to en

GEOMETRY DRAWINGS AND SUPPLIES AND DEFINITIOS:

Freehand: draw by hand without guiding instrument, measurements.......
Line/ Techical drawing: it is a drawing made with the help of suppelies
Compass: it is a tool to make circles an arcs perfect.
Protactor. an instrument for measuringor drawing.
Set  squaes: there  are two special rulers, ther names are 45º triangle and 60/30º triangle.
Eraser: use for eliminate the mistakes
Ruler: for makings lines
Line segment:  given tha segment A, copit with the same length wih a compass

OPERATIONS WITH A SEGMENTS:
Addition
subtraction
Multiply
Division.
IMPORTANT DEFINITIONS ABOUT ANGLES AND LINES:
Parallels: there are two lines wch never intersect
Perpendicular: they are lines which meeet forming four right angles
Oblique: they are lines which are nt parallels neither pependiculars

ANGLES: it is a ligure formed by two rays sharing a common endpoint(vertex)
Tipes of angles-
complementari angles 90º
suplementary angles 180º

Right, obtuse, acute, flat, complet, cero

IMORTANT DEFINITIONS ABOUT CIRCLES:
Circle: set of points at the same distance to a center
Circunference:  it is the full legth of a circle

Center: it is a point equidintance to any points on a circle.

Radius: it is a length of a lne segment fron the center to its perimeter
Diameter: it is the double of the radius
Chord: a line egment which conect two points of the circle not througj the center
Arc: segment of a circle
Arrow. its a line segment enter chord and arc pass to the center

Star polygons: it is a particular polygon case witha star shape, cheated out ok linking together no consecutive vertices of ar regular polygon.

Inscrebed polygons: they are polygons place inside circles so all the vertex of the polygon are placed on the circle.
Convex polygons: any lines draw through the polygon meets its boundary exactly twice.
Non convex or concave: a lin e may be found which meets its boundary more than twice.

TRIANGLES
It is a flat figure with three sides  and three angles.

CUADRILATERALS:
They are polygons with four sides and four angles.

                                                                        

REGULAR POLYGONS:

                                                                         

                                                                           

STAR  POLYGONS:

SYMMETRY:

It is a quaity of some shapes which of their parts are reflection of others.

Reflection symmetry: it is a shape quality which is formed by two halves facing each other with an axis or fold line in between as if both side mirror images of each other.

Symmetry axis: it is a line wich divedes a shape into two symmtry halves. Every element are the same distance from the axis.

Symetry center: it is a center wich divedes a shape into two symmtry halves. Every element are the same distance from the enter.