1. A point
Is an exact position.

2. A line
Is a set of points that is endless in two directions.

3. A line segment
A line segment is a part of a line with two endpoints.

4. Intersecting lines Líneas intersecantes
Intersecting lines cross at one point.

5. Parallel lines Lineas o rectas paralelas
Parallel lines never cross.

6. A ray
A ray is a part of a line with one endpoint.

7. An angle
An angle is two rays with the same endpoint. That endpoint is the vertex of the angle.

8. Right angle and perpendicular ángulo recto y linea perpendicular
A right angle makes a square corner. If two lines,lines segments, or rays make a right angle, they are perpendicular. A right angle has a measurement of exactly 90 degrees angle.

9. Acute angle ángulo agudo
An acute angle is an angle that is open less than a right angle. Has a measurement that is greater than 0 degrees and less than 90 degrees.

10. Obtuse angle ángulo obtuso
An obtuse angle is an angle that is open more than a right angle. It has a measurement that is greater than 90 degrees but less than 180 degrees.

11. Polygons Polígonos
A polygon is a closed figure made up of line segments. Each line segment is a side of the polygon. The point where two side meet is a vertex of the polygon.

12. More on Polygons
Polygons are name by the number of sides they have. The sides form an angle at each vertex.

13. Examples of polygons
Triangle
Quadrilateral
Pentagon
Hexagon
octagon