Interactive resource
Inscribed angle theorem
Geometry. Drag points on a circle: an inscribed angle is half the central angle on the same arc. Free interactive GeoGebra resource — adjust parameters in…
Overview
Drag points on a circle: an inscribed angle is half the central angle on the same arc.
Explanation
Inscribed angle theorem: an angle on an arc is half the central angle on that arc.
Corollaries: an angle in a semicircle is 90°; a 90° inscribed angle subtends a diameter.
Inscribed angles on the same arc are equal.
How to use
Drag three points on the circle and compare inscribed and central measures.