# Box

Calculate the angle between box base 9 x 14 and body diagonal length 18.

## Correct answer:

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

**solid geometry**- cuboid
- space diagonal
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
**goniometry and trigonometry**- cosine

### Units of physical quantities:

### Grade of the word problem:

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