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2x+1=180/12
2x+1=15
2x=15-1
2x=14
x=14/2
x=7
panjang persegi = 7 cm
18>_24x+12
180-12>_14x
168>_24x
7>_x
jadi panjang persegi panjang tersebut maksimal 2x+1=2(7)+1=14+1=15 cm.