The first thing to do before entering fully into the establishment of the meaning of the term right angle is to discover the etymological origin of the words that compose it. In this case, this is what we can say:
-Angle is a word that derives from the Greek, specifically, from “ankulos”, which can be translated as “bent” or “twisted”. That, in turn, gave shape to the Latin “angulus”, which is synonymous with “angle.”
-Recto, on the other hand, comes from the Latin word “rectus”, which means “right”. Specifically, this adjective derives from the verb “regere”, which can be translated as “straighten”.

Angle it is a concept that has several uses. In this case, we are interested in keeping its meaning as the geometric figure which is formed from two rays that share a vertex.

According to its characteristics, it is possible to distinguish between different types of angles. A right angle is an angle that measures ninety sexagesimal degrees (90º). This angle is formed by two rays that are perpendicular to each other and that originate in the vertex they share.

In addition to all the above, we cannot ignore other characteristics that are also very significant, such as the following:
-It is considered to be the easiest angle to identify among all those that exist.
-It’s always the same.

We can find right angles at various figures Geometry planes. If we focus our attention on a square (which has four equal and parallel sides), we will notice that its four interior angles are right angles. This means that each angle of a square measures 90º and that the sum of all its angles totals 360º. The right triangles, for their part, they have a right angle and two acute angles (measuring less than 90º and more than 0º).

Right angles can be combined to form another class of angles. Two right angles, in this frame, give rise to a plane angle (also calling straight angle), which measures 180º. Four right angles, on the other hand, make it possible to obtain a perigonal or full angle: an angle of 360º.

It is worth mentioning that the right angles are part of the set of the convex angles or salient angles, which covers all those angles that measure more than 0º but less than 180º. This implies that acute angles and obtuse angles are also convex angles.

It is also important to know that “Right Angle” is the title of a well-known scientific journal of the Complutense University of Madrid. It is a publication of studies on the city, which has a biannual periodicity with a marked thematic air and which is usually published in the months of May and December.

It basically consists of articles where the city as such is analyzed from different points of view. That is to say, from an architectural, anthropological, artistic, literary, philosophical, sociological, literary point of view, in terms of human geography … In this way, we try to show it as a space full of plurality, richness, intercommunication and also multicultural.