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Panjang = x + 7
K = 2(p+l)
46 = 2(x+7 + x)
46 = 2(2x+7)
46 = 4x+14
4x = 46-14
4x = 32
X = 32/4
X = 8
P = 8+7 = 15 cm
L = 8 cm
Luas = 15 x 8 cm^2
= 120 cm^2