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L = 240 x 210 : 2
L - 50400 : 2
L = 25200
K = 2 x { sisi panjang + sisi pendek}
K = 2 x { 130 + 200}
K = 2 x 330
K = 660
n0 4 L = s x s
s = akar 1296
s= 36
no 5 tdk kelihatan