Raghu had to make a cylindrical aluminium tube. What is the area of the aluminium sheet required to make the tube if the length of the tube is $1 m$ and base radius is $3.5 c m ?$ [Take $π = \frac{22}{7}$ ]

2200 m²

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220 m²

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2200 cm²

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220 cm²

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Solution

The correct option is C
2200 cm²

Since, a tube is hollow, we require curved surface area and not total surface area.

Curved surface area of cylindrical tube $= 2 π r h = 2 \times \frac{22}{7} \times 3.5 \times 100$ [ $1 m = 100 c m$ ]
$= 2200 c m^{2}$ .

So, the area of the aluminium sheet required to make the tube $= 2200 c m^{2}$

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Raghu had to make a cylindrical aluminium tube. What is the area of the aluminium sheet required to make the tube if the length of the tube is 1 m and base radius is 3.5 cm? [Take π=227]

The correct option is C 2200 cm2 Since, a tube is hollow, we require curved surface area and not total surface area. Curved surface area of cylindrical tube =2πrh=2×227×3.5×100 [1m=100 cm] =2200 cm2. So, the area of the aluminium sheet required to make the tube =2200 cm2

Raghu had to make a cylindrical aluminium tube. What is the area of the aluminium sheet required to make the tube if the length of the tube is $1 m$ and base radius is $3.5 c m ?$ [Take $π = \frac{22}{7}$ ]