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l = x
2(x) + 2( 6 + x) = 48
2x + 12 + 2x = 48
4x + 12 = 48
4x = 48 - 12
x = 9
luas = p X l
= 9 x 6
= 54
maaf kalo salah...
P = 6 + x
l = X
K = 2P + 2L
48 = 2(6+x) + 2(x)
48 = 12+2x+2x
48 = 12+4x
48 - 12 = 4x
36/4 = x
x = 9
L = p × l P = 6 + 9 = 15
L = 15 × 9
L = 135 CM²