To find how much steel sheet is needed to make a CLOSED cylindrical tin, which measurement should you calculate?

Class 8MensurationMensuration

AVolume of the cylinder
BCurved surface area only
CTotal surface area
DArea of one circular end

Step-by-Step Solution

A closed tin needs the curved surface plus both circular ends — that is the total surface area, 2πr(r + h).

Answer: C) Total surface area

Key idea: Choosing the right formula — pick by what's asked

- 'Total cloth needed to cover a closed box' → TSA of cuboid.
- 'Paint to cover only the side walls of a room' → LSA of cuboid (4 walls).
- 'How much water fills a tank' → volume.
- 'Label paper around a tin' → CSA of cylinder (only the curved part).
- 'Steel sheet to make a closed pipe' → TSA (CSA + 2 circles).

Before plugging numbers, ask: which surface(s) actually matter for this problem?

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