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K = 96 cm
panjang = 3xl
maka :
K = 2 x (p+l)
96 = 2 x (3l+l)
96 = 2 x 4l
96 = 8l
l = 96/8
l = 12 cm
jadi :
lebar = 12cm
panjang = 3 x 12 = 36 cm
L = p x l
= 36 x 12
= 432 cm²
96 = 2(3x+x)
96 = 2 . 4x
96 = 8x
96/8 = x
12 = x
p = 3x = 3.12 = 36
l = x = 12
L = P x l
L = 36 x 12
L = 432