17. Four mark exercise problems X

A strip of \(4 \ cm\) wide is cut and removed from all the sides of the rectangular cardboard with dimensions \(30 \ cm \times 20 \ cm\). Find the area of the removed portion and area of the remaining cardboard.

 

Answer:

 

Area of the removed portion \(=\)  \(cm^2\)

 

Area of the remaining cardboard \(=\)  \(cm^2\)