Respostas

2013-04-09T01:11:48-03:00

Sem 60° =h/20√3

√3/2 = h/20√3

20 . 3 = 2h

60 = 2h

H = 30

 

Logo A = b.h/2

A = 20√3 . 30/2

A = 300√3