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4(panjang + lebar + tinggi)
4(8 + 7 + 5)
4(20)
=80 cm
luas permukaan
2(8 x 7) + 2(8 x 5) + 2(5 x 7)
2(56) + 2(40) + 2(35)
112 + 80 + 70
262 cm²
b) L. perm Balok = 2(p.l + p.t + l.t)
= 2 ( (8.7) + (8.5) + (7.5) )
= 262 cm²