The point and the line

1. The point and line

In the left picture, the pen has left a mark on the sheet. This is a point.

If the pen moves over the paper is drawn a line.

2. Classes of lines

Depending on the form, we can distinguish the straight (such as d), curved (b), broken (a), mixed with some straight and curved part (c), wavy (e) and spiral (f) lines.

Answer these questions:

 The line b is...... The c is... The d is... The a is... The e is... The f is...

3. The builder uses the level to put the bricks horizontal (b). He uses the plummet to the wall is vertical (c), while the ladder is inclining (d).

According to their position in the space, the lines can be horizontal, vertical and inclining.

Answer these questions:

 El palo de la bandera A es... El palo de la bandera B es... El palo de la bandera C es... El palo de la bandera D es...

4. Parallel, perpendicular and oblique lines

The lines a and b are parallel and although they extend, they will never get closer.

The Lines m (vertical) and n (horizontal) are perpendicular.

The lines c and d, as well as e and f are not perpendicular, but oblique.

Answer:

 The lines e and f are... The lines a and b are... The lines c and d are... The lines m and n are...

5. The point and the line

If we fold a piece of paper, we have a line that divides the plane into two semi-planes.

6. The point

We have a sheet of paper and we do two creases, the lines may intersect at a point. Endless lines can pass for a point. Only one line can pass for two points.

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®Arturo Ramo García.-Record of intellectual property of Teruel (Spain) No 141, of 29-IX-1999
Plaza Playa de Aro, 3, 1º DO 44002-TERUEL