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In a triangle, those points where the lines are known as vertices, while the sides will be each line segment, and for its part, the union of two sides ends forming the Interior of the triangle in question angles.

Of the above, then, obtain salient physical features of this figure flat, which are: three internal angles, three external, also three vertices and three sides.

However, there are different types of triangles, insofar as possible, in relation to the length of its sides we have the equilateral triangle, which is the one that will occupy us here and that is characterized by the three sides of the same size, issue which also happen to be equiangulares, i.e. its three internal angles will present the same measure which in this case is 60 °.

The construction of this type of triangle is plausible to make it using a ruler and a compass, instruments these basic and widely used in this field to draw straight, angles, among others.

In the case of the equilateral triangle path process is quite simple, first, you must trace a circle, then the compass must open in the middle of 120 °, then three points are marked, each respecting the same distance, and finally the plotted points are attached.

It should be noted that this figure has been always very present in the life of man, since it appears in many of the constructions made by this. The archaeological site dubbed Lepenski Vir in Serbia, a prehistoric settlement, which holds around eight thousand years old. The above was an indeed advanced civilization which already by that time dominated areas such as urban planning, architecture, mathematics, astronomy and geometry.

**Article contributed by the team of collaborators.**