A rectangle has an area 18 cm square . If its length and width are whole number , what is its greatest possible perimeter ? [Hint . Find all the possible factor combination of 18 ]
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18=1×17=2(1+17)=2(18)=36 this is greatest perimeter
18=2×9=2(2+9)=2(11)=22
18=3×6=2(3+6)=2(9)=18
18=6×3=2(6+3)=2(9)=18
18=9×2=2(9+2)=2(11)=22
18=2×9=2(2+9)=2(11)=22
18=3×6=2(3+6)=2(9)=18
18=6×3=2(6+3)=2(9)=18
18=9×2=2(9+2)=2(11)=22
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