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.
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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 !
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