The measurements of some rectangles are given in the table below. However, they are
incomplete. Find the missing information.
Length
Breadth
Area
Perimeter
20 cm
14 cm
280cma
68cm
th
12 cm
60 cm
JAS
15 cm
10см
150 cm
50cm how 18 comes
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Answer:
(i)l=20cm,b=14cm
Area =20×14=280 cm2
Perimeter =2(l+b)=2(20+14)=68cm
(ii)b=12cm, Perimeter = 60 cm
2(l+b)=60
2(l+12)=60
2l+24=60
2l=36
l=18
Area = 18×12=216 cm2
(iii)l=15cm, Area = 150 cm
Therefore b=10cm
Perimeter = 2(l+b)=2(15+10)=50cm2
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