VOCABULARY ART

BASIC GEOMETRY CONCEPTS AND DEFINITIONS


Geometry : It is an area of knowledge which study the elements and operations in the plane such as points, lines or shapes.

Point : In the geometry,  the point can be defined as the place where two lines get crossed.

Line : A one - dimensional object  formed of infinite points.

Ray : It is a line starting in a point and extends in one direction.

End point : The end point is a point where a line segment or a ray ends or starts.

Mind point :  The point that is between the end points of the line segment.

Line segment : Is the line with two end points.

Straight line : A line that follows the same direction ( from the start to the  finish ).


Plane : It's a two dimensional surface. 

Lenght : Measurement of something from end to end.




GEOMETRY DRAWING AND SUPPLIES CONCEPTS AND DEFINITIONS :

Freehand : Drawn by hand without guidins instruments.

Line / Technical drawing : It's a drawing made with the help of supplies.

Compass : It's a tool for drawing circles.

Protractor : Instrument for measuring or drawing angles on paper.

Set squares ( UK ) Triangles ( US ) : They are two special rules with a triangular shape. Two tipes : - 45º squares , -  60º or 30º squares.

Eraser  ( rubber, UK ) : Is an object to delete or undo.

Marker : A pen that has fibres.

Rules : An instrument used to draw straight lines.

CIRCLES :

Circle : sed of points at the same distance to center.

Circunference : it is the full lenght of a circle, it is the line around a circle.

Center : it is the point equidistant to any of the points on a circle.

Radius : it is the lenght of a line segment from center to its perimeter.

Diameter : it is a line segment past to the center and conect two parts of the angle.

Chord : is a line that conect two points but not through the center.

Arc : segment of a circle.

Arrow : is the perpendicular line for middle.

Tangent : it is a line that cut ( touch ) in only one point a circle.











POLYGONS :

Star polygons :  it is a particular polygon case with a star form or same.

Inscribed polygons : they are playing placed inside circles so all the vértices of the polygon are placed on the circle.

Circunscribed polygons : they are polygons sorrounding a circle, being its sides tangent to the circle inside.





CLASSIFICATIONS :
    
     Convex polygon: any line drawn throught the polygon meets it boundary exactly twice, one line segment with endpoints pass two points of the shapes.

      Non - Convex  polygon : there exits a line segment between two boundary points that passes outside the polygon.


     -Equiangular: all their corner, angle or vértices are equal.

     -Equilateral :  all edges or sides are of the same lenght.

     -Regular : all their vertices, angles and sides are equal.

     -Irregular :  show different angles and lengths for their sides.


TRIANGLES :

     Triangle :  it is a flat figure with 3 sides and 3 angles.