Question

What is the meaning of a rectangle is 10 cm ×8cm wide.

Answer 1

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