Teaching Trigonometry Sine Functions - Fun Math Help - Game Tips: - Press the 't' key to see a graph that demonstrates the following example.     The sine of angle A can be written as sin A and     sin A equals the ratio (y/r) = (4)/(5) when point D is (x,y) = (3,4) and r=AD=5.     When angle A is in standard position at the origin, the sine ratio of A is (y coordinate)/(radius) = (4)/(5).     The radius r=5 can be calculated from point D(3,4) using 32 + 42 = r2. - Press the 'y' key to restart the game. - When angle A is in standard position at the graph's origin (0,0) then sin A equals (y/r).     Since r is the hypotenuse of a right triangle, r can be found from point D(x,y) using x2 + y2 = r2 .     Consequently, sin A can also be described as (opposite side)/(hypotenuse). - The small square symbol at B indicates AB is perpendicular to BD forming a right angle. - It may take a minute to load the game at dial-up speeds. - The game can be played using the mouse by itself or using the keyboard by itself. - If the game doesn't respond to keyboard input, click inside the game area to reset the game's focus. - Adjust the game's speed by pressing the + or - key repeatedly. More SliderMath   Copyright © All Rights Reserved.
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