# Octagonal tank

The tank has the shape of a regular octagonal prism without an upper base. The base edge has a = 3m, and the side edge b = 6m. How much metal sheet is needed to build the tank? Do not think about losses or sheet thickness.

## Correct answer:

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### You need to know the following knowledge to solve this word math problem:

**algebra**- expression of a variable from the formula
**solid geometry**- surface area
- prism
**planimetrics**- Pythagorean theorem
- right triangle
- polygon
- area of a shape
- triangle

### Units of physical quantities:

### Grade of the word problem:

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