Calculate a circular arc

Calculation of a circular arc

This function calculates the length of an arc or the angle of the straight lines that limit it. The radius and the angle or the length of the arc must be given as arguments.

Formula for calculating an arc of a circle

An arc is part of the outline of a circle. It is determined by two straight lines starting from the center point that intersect the circular line at a certain angle α.

Since a circle has a circumference of 360 degrees, the arc length l can be calculated using the following formula:

\(\displaystyle l=\frac{2 · r · π · α}{360}\)       \(\displaystyle α=\frac{360 · l}{2 · r · π }\)