What is an Angle?

—> An angle is the rotation of a ray from an initial point to a terminal point. Some commonly used terms in angles are:

• Initial side: the original ray
• Terminal side: the final position of the ray after rotation
• Vertex: point of rotation
• Positive angle: if the direction of rotation is anticlockwise
• Negative angle: if the direction of rotation is clockwise

Further, angle measurement is the amount of rotation performed by the initial side to get to the terminal side. There are several units for measuring angles. In this article, we will look at the most commonly used units; Degree Measure and Radian Measure.

What is a Measurement?

—> Measurement begins with a definition of the quantity that is to be measured, and it always involves a comparison with some known quantity of the same kind. If the object or quantity to be measured is not accessible for direct comparison, it is converted or “transduced” into an analogous measurement signal. Since measurement always involves some interaction between the object and the observer or observing instrument, there is always an exchange of energy, which, although in everyday applications is negligible, can become considerable in some types of measurement and thereby limit accuracy.