By A Mystery Man Writer
Right Triangle Altitude Theorem – GeoGebra
geometry - Proving similarity for a triangle inside another triangle given ratio between sides. - Mathematics Stack Exchange
Right Triangle Ratios – GeoGebra
Sine Ratio – GeoGebra
Geogebra in the classroom: Introducing Trigonometry
Trig Ratios and the 30 degree angle – GeoGebra
Unit 6 Lesson 8 on Vimeo
Side Length Ratios Exploration – GeoGebra
Right Triangle with Slider – GeoGebra
Ratio of Sides of a Right Triangle – GeoGebra
Right Triangle Ratios – GeoGebra
Trigonometric ratios the right triangle(in animation) – GeoGebra