Considere o triângulo equilátero ABC de lado a.  Sabemos que a altura do triângulo é h=a.(√3/2)
Defina no triângulo AMC o tangente de 30°

( ) tg 30°=√3⁄5
( ) tg 30°=√3⁄3
( ) tg 30°=√3
( ) tg 30°=√3⁄2
( ) tg 30°=3
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