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p:l = 4x:3x
K = 56
2×(p+l) = 56
4x+3x = 56:2
7x = 28
x = 28:7
x = 4
p = 4x
p = 4×4
p = 16 cm
l = 3x
l = 3×4
l = 12 cm
L = p×l
L = 16×12
L = 192 cm2
56 = 2 . 4a + 3a
56 = 14a
a = 4
panjang = 4.a
=4 x 4
=16
lebar = 3.a
= 3 . 4
= 12
luas = p x l
= 16 x 12
= 192