Simulation Library

Find Circle Center Using Two Chords

Circles

Drag the chord endpoints to see how the perpendicular bisectors intersect at the circle’s true center.

Circle Through Three Points Construction

Construct a circle through three non‑collinear points by drawing the bisectors and finding the intersection.

Central Angle Theorem

Visualize the central angle theorem: a chord’s angle at the centre is twice its angle at point on the arc.

Tangent‑Secant Theorem (Power of a Point)

Explore the tangent‑secant theorem by adjusting a point, tangent, and secants to see PA·PB = PC·PD = PT².