Luas masing masing sisi balok adalah 12 cm persegi, 20 cm persegi, dan 15 cm persegi. Berapakah ukuran panjang, lebar, dan tinggi balok tersebut

Bab Bangun Ruang Sisi Datar

p × l = 12 cm^2
p × t = 20 cm^2
l × t = 15 cm^2

p = 12/l

p × t = 20
12/l × t = 20
12t = 20l
t = 20/12 × l
t = 5/3 l

l × t = 15
l × 5/3 l = 15
l^2 = 15 × 3/5
l = akar 9
l = 3 cm

t = 5/3 × l
t = 5/3 × 3
t = 5 cm

p = 12/l
p = 12/3
p = 4 cm