Question

A closed cylindrical tank is made up of a sheet of metal .The height of the tank is 1.3m and radius is 70cm.How much sq.m of metal sheet was required?
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Answer 1

Answer:

440 m2

Hope it was helpful

Answer 2

Answer:

8.8 m² of metal sheet was required.

Step-by-step explanation:

Given:

• A closed cylindrical tank is made up of a sheet of metal .
• The height of a cylindrical tank = 1.3 m
• Radius of a cylindrical tank = 70 cm

To find:

• How much m² of metal sheet was required?

Solution:

Here we will simply use the formula of total surface area of a cylinder and find its total surface area and that is equal to to the metal sheet which is required to cover the cylindrical tank.

N.B: For doing calculations the nature of the units should be same, so convert the radius which is in cm into m because we need to find the metal sheet required in metre unit only.

• 1 cm = 1/100 m
• 70 cm = 70/100
• = 7/10
• = 0.7 m

✰ Total surface area = 2πr(h + r)

Here,

r is the radius of a cylindrical tank.

h is the height of a cylindrical tank.

Putting the values in the formula, we have:

• Total surface area = 2 × 22/7 × 0.7(1.3 + 0.7)
• Total surface area = 2 × 22/7 × 0.7 × 2
• Total surface area = 2 × 22/7 × 7/10 × 2
• Total surface area = 2 × 22 × 1/10 × 2
• Total surface area = 44 × 1/10 × 2
• Total surface area = 88 × 1/10
• Total surface area = 88/10
• Total surface area = 8.8 m²

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