Special Angles

Here is a chart of the special angles for 30°, 45°, and 60°. (i.e., sin60° = rt(3) ÷ 3).

  30° ( ÷ 6) 45° ( ÷ 4) 60° ( ÷3)
sin 1 ÷ 2 rt(2) ÷ 2 rt(3) ÷ 3
cos rt(3) ÷ 2 rt(2) ÷ 2 1 ÷ 3
tan rt(3) ÷ 2 1 rt(3)
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