How to calculate central angles, inscribed angles and angles formed by radii, chords, tangents and secants.
This also explains how to calculate angles that are located outside of a circle formed by 2 tangents, 2 secants or a tangent and a secant.
Made From Tangents, Secants, Radii, Chords
For a central angle calculator which solves for Arc Length, Radius or Central Angle, click here
