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p : l = 5x : 3x
10x + 6x = 96
16x = 96
x = 6 cm
p = 5 x 6 = 30 cm
l = 3 x 6 = 18 cm
Luas = p x l = 30 x 18 = 540 cm2 (D)
Semoga membantu:))
K=2(p+l)
96=2(5x+3x)
96=2(8x)
96=16x
x=6cm
sehingga, p=30 cm dan l=18 cm
L=p×l
=30cm×18cm
=540cm2 (D)