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L = 36 cm^2
p = 4l
l = l
K = ?
L = p x l
36 = 4 l x l
36 = 4 l^2
36/4 = l^2
9 = l^2
akar 9 = l
3 cm = l
jadi, p=4l
p=4(3)
p=12 cm
K = 2 (p + l)
= 2 (12 + 3)
= 2 (15)
= 30 cm