The Arc of a Circle Calculator can also be used to: This calculator uses the following formulas: Arc length = 2 Radius (Central Angle [degrees] / 360), Chord length = 2 Radius sin (Central Angle ...

The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown. To do ...

In order to derive the formula to calculate the angle at the centre of the sector, the formulae for the arc length and area of a sector can be rearranged so that we can calculate the fraction of ...