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A melhor resposta!
2014-05-23T04:35:11-03:00
Sen a / cosa = tan a
sen a / sen a / 2 = tan a
2 sen a / sen a = tan a
2 = tan a
--------------------------------

tan a = (x+3) / (2x)
2 = (x+3) / (2x)
4x = x + 3
3x = 3
x = 1

----------------------------
x + 3 = 
1 + 3 = 4
----------------------

2x = 
2 . 1= 2
------------------

2 . 4 /2 = 
8/2 = 
4m²
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1 5 1
2014-05-23T05:59:37-03:00