Respostas

2013-08-27T22:23:55-03:00
Y+x+x=18
y+2x=18 
y=18-2x 

x²=h²+(y/2)² 
x²=h²+y²/4 
4x=h²+y²

4x²=h²+(18-2x)²  
4x²=3²+(18-2x)²
4x²=9+324-72x+4x²
9+324-72x=0
72x-333=0
72x=333
x=333/72=4,625m

y=18 - 2x
y=18 - (2 . 4,625)
y=18 - 9,25
y=8,75m