t = 13 cm
V = 624 cm³
p = l + 2
V = p × l × t
624 = (l+2) × l × 13
48 = l(l + 2)
48 = l² + 2l
l² + 2l - 48 = 0
(l + 8) (l-6) = 0
l = -8 or l = 6
l = -8 (salah karna tdk mungkin min)
jadi jawabannya l = 6
jadi p = 6 + 2 = 8 cm (b)
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t = 13 cm
V = 624 cm³
p = l + 2
V = p × l × t
624 = (l+2) × l × 13
48 = l(l + 2)
48 = l² + 2l
l² + 2l - 48 = 0
(l + 8) (l-6) = 0
l = -8 or l = 6
l = -8 (salah karna tdk mungkin min)
jadi jawabannya l = 6
jadi p = 6 + 2 = 8 cm (b)