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p = 6 cm
l = 9 cm
Maka,
L persegi panjang = p x l
= 6 x 9
= 54 cm²
L persegi = L persegi panjang
Sehingga,
L persegi = 54 cm²
s² = 54
s = √54
s = 3√6 cm ----> s = 7,35 cm