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sisi 1 = p
sisi 2 = 2p
sisi 3 = p+4
maka :
K = sisi1 + sisi2 + sisi 3
= p + 2p + p+4
= 4p + 4
= p + 2p +(p+4)
= 3p + (p+4)
= 4p + 4