The Law of Cosines: What is this about?
A Mathematical Droodle

The applet could serve to demonstrate the Law of Cosines and also the fact that the centers of the squares constructed (externally) on the sides of a parallelogram form a square, which is known as one of V. Thebault's theorems.

References

1. R. Nelsen, Proofs Without Words, MAA, 1993, p. 19

• The Law of Cosines (Cosine Rule)
• The Illustrated Law of Cosines
• The Law of Sines and Cosines
• The Law of Cosines: Plane Tessellation
• The Law of Cosines: after Thâbit ibn Qurra
• The Law of Cosines: Unfolded Version
• The Law of Cosines (Independent of the Pythagorean Theorem)

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