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l= lebar
panjang 4 kali lebar --> p = 4l sub ke luas
Luas = pl =36
(4l)(l) = 36
l² = 36/4 = 9
l = 3
p =4(3) = 12
keliling = 2(p+l) = 2(3+12) = 2(15) = 30