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⇒ (3x)(4x) = 108
⇒ 12x² = 108
⇒ x² = 9
⇒ x = 3 cm
maka
a = 4(3) = 12 cm
t = 3(3) = 9 cm
ukuran 3 kali semula
A = 3(12) = 36 cm
T = 3(9) = 27 cm
maka luas jajargenjang yang baru ialah
L = 36 · 27
= 972 cm²
Terimakasih semoga membantu