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⇒ K = 2 (p+l)
⇒ 94 = 2 (7+l+l)
⇒ 47 = 7 + 2l
⇒ 47 - 7 = 2l
⇒ 40/2 = l
⇒ l = 20 , jadi p = 7 + 20 = 27
masukkan ke rumus ⇒ L = p × l
= 27 × 20
= 540 cm²