Definition of perigonal - What it is, Meaning and Concept

An angle , a term from the Latin word angŭlus , is a figure that is formed from the intersection of two planes or straight lines in space or on a surface.According to their characteristics, angles are classified in different ways.

The angle measuring 360º is called perigonal , equivalent to 2π radians .The perigonal angle can also be called full angle or whole angle .

Keep in mind that, in flat geometry, an angle develops with two half-lines that are joined at the vertex (the point at which they intersect).To the remaining half-line fixed is usually called A , while the semi-straight that moves for the formation of the angle opening is called B .

That opening that is created between the semi-straight lines is the amplitude , measured in degrees.In the case of the perigonal angle, the amplitude is 360º .Therefore, the perigonal angles give place to a circle .

It is important to mention that perigonal angles can be formed from the sum of smaller angles.If we add four right angles (which are the angles that measure 90º ), we will obtain a perigonal angle ( 90º + 90º + 90º + 90º=360º ).

Since the flat angles measure 180º , the perigonal angle can also be developed by adding two flat angles: 180º + 180º=360º .Other possibility is that three obtuse angles of 120º are consecutive and compose a perigonal angle (since 120º + 120º + 120º is equal to 360º ).

It should be noted, on the other hand, that the perigonal angles are concave angles .It is called the angles whose amplitude ranges from 180º to 360º .