Angle

An angle is defined as the amount of rotation between two rays.
Figure 1: Angle

An angle is defined as the amount of rotation between two rays. The point where the rays start is called the vertex. There are two systems for measuring angles in mathematics: degrees and radians. While the degree angle system is often used to introduce concepts in math, the radian system eventually becomes the preferred unit for measuring angles[1].

Types of Angles

Perpendicular Angle

A perpendicular angle is equal to a quarter of a full rotation.

Acute Angle

An acute angle is defined as an angle smaller than a perpendicular angle.

Obtuse Angle

An obtuse angle is defined as an angle greater than a perpendicular angle.

Links

References

  1. Radians Versus Degrees
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