Respostas

2013-09-17T22:22:15-03:00
2013-09-17T22:23:08-03:00
3² = 1,5² + x²
9 = 2,25 + x²
x² = 9 - 2,25 
x² = 6,75
x = raiz de 6,75
x = 2,60

6 . 3 .  2,60 / 2

6 . 7,8 / 2

6 . 3,9

23,4 m²