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Trigonometric Ratios

Ratios in right triangles
Sine Ratio
SIN and COS 'graphic' calculator
Make right triangles with given ratios.

 
From circling to surfing
060512a1_worksheet.ggb

Books
The Ten-Centimeter Circle is an introductory activity for trigonometry learning suggested by Henri Picciotto in his book Geometry Labs.
Trigonometric Delights by Eli Maor; Chinese version: 毛起來說三角