Inscribed Angle Calculator
Find the inscribed angle from its central angle (it is half).
An inscribed angle is exactly half of the central angle that subtends the same arc.
The math behind it
The Inscribed Angle Theorem: an angle drawn from the circle to an arc is half the central angle on that same arc.
Worked example
Central angle 80° → inscribed angle 40°.
FAQ
What about an angle in a semicircle?
It is always 90°, since the central angle (the diameter) is 180°.