Calculate the length of a chord from the circle radius and central angle.
The chord length of a circle is found using the formula 2r·sin(θ/2), where r is the radius and θ is the central angle in radians.
Chord Length
chord = 2r × sin(θ/2)
The diameter — which corresponds to a central angle of 180°.
Yes — for reflex angles the formula still gives the chord length, which is the same as for the supplementary angle.