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Keliling persegi panjang < 74
Keliling = 2p + 2l
2p + 2(2p-26)
2p + 4p - 52 < 74
6p - 52 < 74
6p < 126
Kalau kelilingnya = 74 maka p = 21, sedangkan kalau mau kurang dari, p-nya 20.