What is the meaning of a rectangle is 10 cm ×8cm wide.
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Given
Length of rectangle l=10 cm and
Breadth of rectangle b=8 cm
Perimeter =2 (Length + Breadth)
=2(10+8) cm
=2×18
=36 cm
If each side of the rectangle is increased by x cm , then ,
Perimeter =2(10+x+8+x)
=2(18+2x)
=(36+4x) cm
According to the given condition,
36+4x=2(36)
36+4x=72
4x=72−36
4x=36
x= 26 / 4
We get ,
x=9
Hence ,
Length of new rectangle =1+x=10+9=19 cm and
Breadth of new rectangle =b+x=8+9=17 cm
Area = Length × Breadth =19×17cm²
=323cm² _____ Ans
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