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Permukaan balok ada 3 pasang sisi yang kongruen (sama)
Ukuran balok = 7cm × 5cm × 3cm
Luas permukaan balok = (2 × ( 7cm × 5cm)) + (2 × (5cm × 3cm)) + (2 × (7cm × 3cm)) = (2 × 35 cm² ) + (2 × 15 cm² ) + (2 × 21 cm² ) = 70 cm² + 30 cm² + 42 cm² = 142 cm²

t = 5 cm
p = 7 cm
l = 3 cm
L = p × l
= 7× 3
= 21 cm²
maaf klo salah