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⇒ kell. persegi panjang = 68
⇒ 2 (p+l) = 68
⇒ 2 (27+l+l) = 68
⇒ 2 (27+2l) = 68
⇒ 54+4l = 68
⇒ 4l = 68-54
⇒ 4l = 14
⇒ l = 14/4 = 3,5
∴ p = 27+l
= 27+3,5
= 30,5