What is Angle:

Angle is a concept of Geometry to refer to the space between the intersection of two lines that start from the same point or vertex, and which is measured in degrees.

The word comes from Latin angŭlus, and this in turn from the Greek ἀγκύλος, which means "stooped".

In everyday use, the word angle can also be used as a synonym for corner (in the sense of the incoming angle), such as: "In what corner of the room do you prefer to put the sofa?"; corner or edge: “Be careful with the table's angles: you can hit yourself”; as well as point of view: "Have you already evaluated the situation from all angles?"

Types of angles

According to its opening in degrees

Null angleIt is the one formed by two lines that coincide at their vertex and at their ends, therefore, their opening is 0 °.Acute angleIt is one with a vertex opening greater than 0 ° and less than 90 °.Right angleIt is made up of two rays whose vertex opening is 90 °.Obtuse angleIt is one whose vertex opening is greater than 90 ° and less than 180 °.Plain angleIt is that constituted by two rays with a vertex of 180 ° of opening.Oblique angleAlso called reflex or concave, it is one that has a top opening vertex of 180 ° and less than 360 °Perigonal angleAlso called full angle, it is one that has a 360 ° opening.

Sum of angles

Complementary anglesIt is the one that, together with another, adds an opening of 90 °. They may or may not be consecutive angles in space, but they will be complementary as long as the sum of the degrees of their angles is 90 °.Supplementary anglesIt is called the one that, together with another, adds an opening of 180 °.