A triangle circumscribed by a circle
The triangle ABC has been circumscribed by a circle. Move the points A, B, or C and watch how the intersection of the perpenducular bisectors moves, yet the circle always passes through A, B and C.
Lengths of Segments formed by Intersecting Chords
Random Polygon with Random Colour, including JS code
Exploring area of a parallelogram
Lemma: Cubic root from cube
SOH CAH TOA for angles