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= v21² + 28²
= 35 cm
L sisi tegak balok:
= 4 (p × l)
= 4 (50 × 42)
= 8.400 cm²
L tutup balok:
= r²
= 42²
= 1.764 cm²
L sisi tegak limas:
= 4 (1/2 × 42 × 35)
= 2.940 cm²
L total = 8.400 + 1.764 + 2.940
= 13.104 cm²