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Keliling = 50m
Satu Kaki = 2p + 5m
Keliling = Kaki + Kaki + Alas
50 = (2p + 5) + (2p + 5) + alas
50 = 4p + 10 + alas
50 - 10 = 4p + alas
40 = 4p + alas
alas = 40 - 4p