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l = 3x ⇒ 3 . 6 = 18 cm
K = 2 (p + l)
96 = 2 (5x + 3x)
96 - 2 . 8x
96 = 16x
6 = x
96 =2 (5x + 3x)
96 = 2 (8x)
96 = 16x
x = 96 : 6 = 16 cm
Panjang = 5x = 5 x 6 = 30 cm
Lebar = 3x = 3 x 6 = 18 cm