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d₁ = 4x
d₂ = 3x
Maka,
L = 216
216 = ½ d₁d₂
432 = d₁d₂
432 = (4x)(3x)
432 = 12x²
x² = 432/12
x² = 36
x = 6
Sehingga,
d₁ = 4(6) = 24
d₂ = 3(6) = 18
Rumus sisi:
s = ½ Phytagoras[d₁,d₂]
s = ½ x 30
s = 15
Sehingga, kelilngnya adalah:
K = 4s
K = 4 x 15
K = 60 cm