Răspunsuri

2014-02-12T16:16:19+02:00
Diagonala cub = latura * √3 =>
l√3=12cm
l = 12/√3 = 12√3/3 = 4√3cm = 40√3 mm = 0,4√3 dm

Aria cub = 6 × Aria fata = 6 × l² = 6 × (40√3mm)² = 6×1600×3 = 28800 mm² 

Volum cub = l³ = (0.4√3)³ = (0.4×1.73)³ = 0.69³ = 0.33 dm³

diagonala fata = l√2 = (4√3)×√2 = 4√6 cm
2 5 2