Question

12. A cardboard sheet is 45 cm 20 cm. A strip 4.5 cm wide is cut from all around. Find the areas
the strip and the area of the remaining cardboard.​

Answer 1

area of cardboard =

45× 20

900 cm²

sides of remaining cardboard =

width =20-9=11

length =45-9=36

area of remaining cardboard=

36×11

396cm²

Area of strip =

900-396

504cm²

Hope it helps !