# Octagon

We have a square with a side 56 cm. We cut corners to make his octagon. What will be the side of the octagon?

## Correct answer:

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

**planimetrics**- Pythagorean theorem
- right triangle
- polygon
- triangle
- square
- diagonal
**goniometry and trigonometry**- sine

### Units of physical quantities:

### Grade of the word problem:

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