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31080 = 74 × l × 42
31080 = 3108l
10 = l
LP = 2(p × l) + 2(p × t) + 2(l × t)
= 2(74 × 42) + 2(74 × 10) + 2(42 × 10)
= 2(3108) + 2(740) + 2(420)
= 6216 + 1480 + 840
= 8536 cm²
Jadi luas aquarium tersebut adalah 8536 cm² (Luas permukaan jika aquarium memiliki alas penutup).
31.080 = 74 x l x 42
31.080 = 3108 l
l = 31.080 : 3108
l= 10
lp= 2 x (pxl + pxt + lxt)
= 2 x (74x10 + 74x42 + 42x10)
= 2 x (740 + 3108 + 420)
= 2 x 4268
= 8536
jadi, luas akuarium seluruhnya= 8536 cm²