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p = 14
k = 2p + 2l
100= 2.14 + 2l
100 = 28 + 2l
2l = 100-28
2l = 72
l = 72/2
l = 36
luas = p x l
= 14 x 36 = 504
l = K : 2 - p
= 100 : 2 - 14
= 36 cm
L = p x l
= 36 x 14
= 504 cm²