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K = 100 cm
K = 2p + 2l
100 = 2(3l) + 2l
100 = 6l + 2l
100 = 8l
100/8 = l
12,5 = l
l = 12,5 cm
p = 3*l
p = 3*12,5
p = 37,5 cm
L = p*l
L = 37,5 * 12,5
L = 468,75 cm2