Thales’s theorem
Thales’s theorem is an interactive experiment in Plane Geometry, a free simulation from StudyFi Lab that runs right in your browser.
Every angle inscribed in a semicircle is a right angle: if AB is a diameter and C lies on the circle, the angle ACB is 90°.
Try this: Move C along the circle, or move A and B — the angle at C stays 90°.
Frequently asked questions
What does the “Thales’s theorem” experiment show?
Every angle inscribed in a semicircle is a right angle: if AB is a diameter and C lies on the circle, the angle ACB is 90°.
How do I try “Thales’s theorem”?
Move C along the circle, or move A and B — the angle at C stays 90°.
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