Question

 A closed box of dimensions 40 cm x 20 cm x 5 cm is made from a sheet of metal. How much sheet of metal is required? 
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Answer 1

Answer:

A cuboidal tin box opened at the top has dimensions 20 cm × 16 cm. × 14 cm. What is the total area of metal sheet required to make 10 such ...

Answer 2

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Required data,

length of the closed box =40cm

breadth of the closed box =20cm

height of the closed box=5cm

we observ that it is a cuboid because it has three dimensions

To solve the sum we use total surface area of the closed box

Total surface area of the cuboid=length ×breadth ×height

Total surface area of thr cuboid=40×20×5=4000cm²

lateral surface area of the cuboid=2×length(height+breadth)

lateral surface area of the cuboid=2×40(5+20)=2×40×25=2000cm²