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misal, p = 4x, l = 3x
maka
L = 180 cm²
⇒ p · l = 180
⇒ (4x)(3x) = 180
⇒ 12x² = 180
⇒ x² = 15
⇒ x = √15 cm
Sehingga
p = 4x = 4√15 cm
l = 3x = 3√15 cm
Jadi,
K = 2(p + l)
= 2(4√15 + 3√15)
= 2(7√15)
= 14√15 cm
Terimakasih semoga membantu