
Teaching Trigonometry Tangents  Fun Math Help  Game Tips:  Press the 't' key to see a graph that demonstrates the following example.  The tangent of angle A can be written as tan A and equals the slope from point A(0,0) to point D(2,4). This tangent ratio = slope = (rise)/(run) = (change in y)/(change in x) = (40)/(20) = (4)/(2) = 2/1.  Press the 'y' key to restart the game.  Generally, when angle A is in standard position as shown at the graph's origin (0,0) then tan A equals the ratio = (rise)/(run) = slope. Also tan A equals (opposite)/(adjacent) = (y)/(x).  The small square symbol at B indicates AB is perpendicular to BD.  It may take a minute to load the game at dialup 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. 
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