BASIC GEOMETRY CONCEPTS AND DEFINITION

• GEOMETRY: is a study that represents the lines and points. 
• POINT: is a place where two lines joined. Has not dimensions, no height and no width. 
• LINE: is an object of a dimension, formed by infinite points. 
• RAY: is a line which begins at particular point and extends in one direction. 
• ENDPOINT: is the point where a segment ends or start. 
• MIDPOINT: is the point that is in the middle of a segment. 
• LINE SEGMENT: is a segment that has a begin and final. 
• STRAIGHT LINE: is a line that two points follow the same direction. 
• PLANE: is a two dimensional surface. In the space the plane can be defined by two parallel, lines, one point and the straight line. 
• LENGTH: is a measurement of something from end to end.

    DEFINITIONS ABOUT ANGLES AND LINES 

• PARALLELS: are two lines than never intersect
• PERPENDICULAR: two lines former right angle or 90 grades angle.
• OBLIQUE: is a line that it is not parallel and it´s a perpendicular.
• ANGLE: are two lines when have one point common.

 CLASIFICATE ABERTURE

• RIGHT: are two lines intersect 90 grades.
• OBTUSE: angle has more than 90 grades.
• ACUTE: it´s an angle former less 90 grades.
• FLAT: this angle has 180 grades.
• NULE: this angle don't move

CLASIFICATE TWO ANGLES

• COMPLEMENTARY ANGLES: are two angles forming 90 grades
• SUPPLEMENTARY: are two angles forming 180 grades
• ADYANCENT: are angles that share one side on the vertex

THE ANGLES BISECTOR

• BISECTOR: is a line who divided two lines in two parts

IMPORTANT DEFINITIONS ABOUT ANGLES

• CIRCLE: set of points at the same distance to a point called centre.
• CIRCUMFERENCE: It is the full lenght of a circle .The complete distance around a circle.
• CENTRE: it is the point equidistant to any of the point of a circle
• RADIUS: it is a line between the centre and the circle.
• DIAMETER: a line segment that passees through the centre and connects two points of a circle.
• CHORD: a line which connects two points of a circle not through the centre.
• ARC: is a segment of a circle.
• TANGENT: is a line touch only one point
• OUTER: when an element doesn't touch the circumference or another element.
• INNER: when an element is fitted inside the circumference or another element begin tangent or not.
• CONCENTRIC CIRCLES: they are circles which different radius but place in the plane sharing the centre.