Meaning of Angle

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 vertexand which is measured in degrees.

The word comes from the Latin angleusand this in turn from the Greek ἀγκύλος, which means “bent”.

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

types of angles

According to its opening in degrees

null angle It is the one formed by two lines that coincide at their vertex and at their ends, therefore, its opening is 0°.
Acute angle It is one with a vertex opening greater than 0° and less than 90°.
Right angle It is made up of two rays whose vertex opening is 90°.
Obtuse angle It is one whose vertex opening is greater than 90° and less than 180°.
flat angle It is the one made up of two rays with a vertex of 180° opening.
oblique angle Also called reflex or concave, it is one that has a vertex opening above 180° and less than 360°
perigonal angle Also called a complete angle, it is one that has an opening of 360 °.
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sum of angles

complementary angles It 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 angles It is called the one that, together with another, adds an opening of 180 °.

According to your position

center angle It is the one whose vertex is in the center of a circumference.
inscribed angle The one where the vertex is a point of the circumference, and where this, in turn, is cut by the rays that constitute it. It is made up of two chords of a circle that meet at a common point of the circle forming a vertex.
inside angle One that is inside a polygon. It is also called the angle whose vertex is on the inside of the circumference and which is formed by chords at whose point of intersection a vertex is formed.
outside angle The vertex is located at a point external to the circumference and its sides are rays that are, in relation to it, in a secant position, tangent or both.
semi-inscribed angle It is the one whose vertex is on the circumference, and is made up of a chord and a tangent line that converge at the vertex.

See also Type of angles.