AK=AN=8 cm
NC=CM=18 cm
BK=BM=12 cm
P=AK+AN+NC+CM+BK+BM=2*8+2*18+2*12=76 cm
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AK=AN=8 cm
NC=CM=18 cm
BK=BM=12 cm
P=AK+AN+NC+CM+BK+BM=2*8+2*18+2*12=76 cm