Respostas

2013-12-06T11:00:26-02:00
R² = (L/2)² + (r/2)²
r² = L²/4 + r²/4
L²/4 = r² - r²/4
L²/4 = 4r²/4 - r²/4
L²/4 = 3r²/4
L² = 3r²
L = \/(3r²)
L = r\/3
r = 3
L = 3\/3 cm