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A melhor resposta!
2014-04-13T17:00:33-03:00
H= \frac{L*\sqrt{3} }{2}
H = altura
L = lado

H= \frac{ \sqrt{12} *\sqrt{3} }{2} \\\\H= \frac{ \sqrt{12*3} }{2} \\\\H= \frac{ \sqrt{36} }{2} \\\\H= \frac{6}{2} \\\\H=3

a altura mede 3 m
2 5 2