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panjang = 2x
lebar = x
Luas = 72 cm
maka :
L = p x l
72 = 2x x x
72 = 2x²
x² = 72/2
x = √36
x = 6 cm
jadi nilai x + 5 = 6 + 5 = 11
72 = 2x . x
72 = 2x²
x² = 72 : 2
x² = 36
x = √36
x = 6 cm
jadi x + 5
= 6 + 5 = 11