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Matematika SMP Kelas VIII
K = 2 (p + l)
12√5 = 2 ( 4√5 + l)
12√5 = 8√5 + 2l
2l = 12√5 - 8√5
2l = 4√5
l = 2√5 cm
L = p × l
= 4√5 × 2√5
= 4 × 2 × 5
= 40 cm²