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L : p = l
60:6 = 10
b. panjang = 6 + X ; lebar = X
keliling = 2 x (panjang + lebar)
60 = 2 x (6 + X + X)
60 = 2 x (6 + 2X)
60 = 12 + 4X
60 - 12 = 4X
48/4 = X
12 = X
Jadi, panjang = 6 + X
= 6 + 12
= 18
lebar = X
= 12