Carilah luas permukaan Balok dengan panjang sisi berikut A. P=25cm, L=12cm, T=10cm B. P=5dm, L=45cm, T=5dm C. P=3,2m, L=18cm, T=65cm

ut adiuvet...........QED

A. L = 2 × (p×l + p×t + l×t)

= 2 × (25×12 + 25×10 + 12×10)

= 2 × (300 + 250 + 120)

= 2 × 670

= 1.340 cm^2


B. L = 2 × (p×l + p×t + l×t)

= 2 × (5×4,5 + 5×5 + 4,5×5)

= 2 × (22,5 + 25 + 22,5)

= 2 × 70

= 140 cm^2



C. L = 2 × (p×l + p×t + l×t)

= 2 × (320×18 + 320×65 + 18×65)

= 2 × (5.760 + 20.800 + 1.170)

= 2 × 27.730

= 55.460 cm^2