Question

Please help

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A company is making a steel reinforced concrete tunnel to prevent water from coming into the area. They are going to cover it with a protective coating.

They need to know the surface area of the tunnel to purchase the protective coating.

Calculate the surface area of the tunnel

Answer 1

The surface area of the cylinderical tunnel needed to purchase the protective coating is 452.16cm².

How to calculate the surface area?

Your information is incomplete. Therefore, an overview of the surface area of a cylindrical tunnel will be given.

Let's assume that the radius is 4cm and the height is 7cm. The surface area of the tunnel will be:

= πr²h + 2πr²

= (3.14 × 4² × 7) + (2 × 3.14 × 4²)

= 351.68cm + 100.48cm

= 452.16cm²

In conclusion, the surface area is 452.16cm².

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