Penjelasan dengan langkah-langkah:
Volume = 33 liter
Volume = 33 dm³
Volume = 33 × 1.000 cm³
Volume = 33.000 cm³
p × l = 55 cm × 20 cm
p × l = 1.100 cm²
Volume balok = p × l × t
t = Volume balok
p × l
t = 33.000
1.100
t = 30 cm
Luas kaca minimal = Luas permukaan balok tanpa tutup
Luas kaca minimal = p × l + 2 × (p + l) × t
Luas kaca minimal = 55 × 20 + 2 × (55 + 20) × 30
Luas kaca minimal = 1.100 + 60 × 75
Luas kaca minimal = 1.100 + 4.500
Luas kaca minimal = 5.600 cm²
- Menentukan Tinggi Tabung
v = p × l × t
33 liter = 55 × 20 × t
( 33 × 1000 ) = 1.100 × t
33.000 = 1.100 × t
t = 33.000 ÷ 1.100
t = 330 ÷ 11
t = 30 cm
- Menentukan Luas Kaca Minimal
( p × l ) + 2 ( ( p × t ) + ( l × t ) )
( 55 × 20 ) + 2 ( ( 55 × 30 ) + ( 20 × 30 ) )
1.100 + 2 ( 1.650 + 600 )
1.100 + 2 ( 2.250 )
1.100 + 4.500
5.600 cm²
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