Basic geometry concepts and definitions

Geometry: It's an area of knowledge wich studies any elements and operations on/in the plane such as point.

Greek: Geo is metry is measurement.

Point: In geometry a point can be defined as place or location were two lines intersect. A point has not dimensions, no height and no width.

Line: A one-dimensionalobject formedof infinite points. It has not end and continues on forever in an plane.

Ray: A line wich begins at a particular point (called the endpoint) and extendsendlessly in one direction.

Mindpoint: Is the point that is halfway beetween the endpoints of the line segment.

Line segment: It's a line with two endpoints.

Length: Measuremet of something from end to end.

Freehand: Draw by hand without guiding instruments, measurements.

Important definition about circles 

Circle: Set of point at the same distance (equidistance) to a point called center (the line).

Circuference: It's the full length of a circle, the complete distance around a circle.

Center: It's the point equidistant to any of the points on a circle.

Radius: It's the length of a line segment from the center to perimetre.

Diameter: A line segment that passes through the center and conects two points of a circle.