### UnivHypGeom26: Trigonometric laws in hyperbolic geometry using Geometer's Sketchpad

We use Geometer's Sketchpad to illustrate the four main laws of trigonometry in Universal Hyperbolic Geometry. These are Pythagoras' theorem, the Triple quad formula, the Spread law and the Cross law. We use custom tools to calculate quadrance and spread. We illustrate each law with a variety of examples. Along the way we show dual triangles, and explain some other features of GSP.CONTENT SUMMARY: Introduction @00:11; Quadrance @02:09; Spreads 04:37;Dual triangle @07:10 ; perpendicularity; Pythagoras' theorem @09:26; Triple quad formula @12:12; The Spread law @15:16; The Cross law? @16:17 (THANKS to EmptySpaceEnterprise)

Length:
20:20