VOCABULARY

BASIC GEOMETRY CONCEPTS AND DEFINITIONS

Geometry   It is  an area of knowledge  which studies only elements and operation on the plane such as points

Greek   Is earch metry is measurement 

Point   In geometry a point can be defined as place  or location where 2  lines intersect. A point hasn´t dimensions no height and no width. 

Line   A one dimension object formed of infinite points.It hasn´t end and continues on forever in a plane 

Ray   A line which behinds a to particular point called the earth point and extends end lessly  in one Direction

Mindpoint   Is the point that is half way between the endpoints of the line segment

Line segment   It's a line with the endpoints

Lenght   Measurement of something from end to end

Geometry   Drawing and subjects concepts and definitions

Freehand   Draw by without  guiding instructions

Line/Techimal Drawing   It's a drawing used for architector or enginiering plans

Compass   It's a tool for drawing circles and also for measuring distances between points, consisting of 2 arms linked by a hinge

Protactor   An instrument for measuring of drawing angles in a paper, usually a flat semicircular transparent plastic sheet graduated in degrees

Set Square and Triangles   They're 2 special rulers 

Eraser   Is a tool that sirves to quit points, lines, etc....

Ruler   Is a tool that sirves to mide lenghts

Circle   Set of ponts at the some distance (equidistant) to a point called center

Circunference   It's the full lenght of a circle. The complete distance around a circle

Center   It's the point equidistant to any of the points an a circle

Radius   This is the lenght of a line segment from the center and conects 2 points of o circle

Chord   A line segment which conects 2 points of the circle but don't pass to the center

Anc   Line segment of a circle

Paralells   They're lines which never intersect themselves so all their points are equidestent

Perpendicular   They're lines which meet farming 4 right angles

Oblique   They're lines which aren't paralells neither perpendicular

Angle   It's a figure formed by 2 rays sharing a common endpoint

Complementary   They're angles which sum is 90 º

Suplementary   They're couples of angles which sum is 180 º

Adjacents   They're angles that share one ride and the vertex

Types of angles   

Right                                       Obtuse
  
 



Acute                                Flat

  
Complete                           Zero
                  



The angle bisector   It's an angle that is divide into 2 parts equals

Star Palygon It's a particular palygan are without a star shope, created aut of linking together non consecutive vertex of a regular polygon.

Inscribed polygons They're polygons place inside circles so all vertex of the polygon are ploced on the circle.

Circunscribed They're polygons sarraunding a circle being it's sides tangent to the circle inside.

Equiangular All the corners, angles and vertex are equal.

Equilateral All edges or sides are of the same lenght

Regular All their vertex, angles and sides are equal

Irregular Shaw different angles and lenght for their sides. 

Triangle It's a flot figure with 3 sides and three angles.

Equilateral   3 sides

Isosceles   2 sides equal

Scalene  3 sides no equal

Right  1 angle sum 90º

Acute   3 angle equal

Obtuse  1 angle < 90º

Quadrilaterals  They are polygons winth 4 sides and four vertices

Parallelograms  They're quadrilaterals with 2 pairs of paralellos apparide equal sides and 2 pairs of apparide equal angles their diagonal bisect eoch other 

Square 4 sides = 4 angles

Rectangle  4 sides = 2 by 2

Rhambus  4 sides = 4 angles = 2 by 2

Rhamboid  4 sides = 2 by 2 , 4 angles = 2 by 2

Trapezium  Only one pair of sides are paralles

Right trapezium  1 angle = 90º

Isosceles Tropezium  2 sides paralles, 2 sides =

Scalen Trapezium  2 sides paralles, 4 equals

Trapezoid  4 sides =/ non paralles

SYMMETRY

It´s a quality of same shapes which some of their parts are reflectione of others.

Reflection symmetry   It´s a shape´s quality which is formed by 2 halves facing each other with on axis or fold line in between as if  both sides were mirror images of each other

Symmetry axis   It´s a line which divides a shape into 2 symmetric halves. Symmetric points are on perpendicular line to it.

Central Symmetric   It´s the reflection of an object through a point called the symmetry center. Symmetric par of points are collinear with the center.