152 cm
The length is (18 centimeters) minus (the width)
150 cm !
46 centimeters
Length 17 cm. Width 10 cm.
77cm!
Do-it-in-your-head method: Length plus width is half the perimeter ie 161 cm, of which 68 is width so the length is 93 cm.
9 cm
153 cm
16 cm
3 cm
Perimeter of rectangle = 2 x (Length + Width) = 2 x (L + 18) or = (2L + 36) centimetres.
width:10,length;17 17*2+10*2=54