# Calculate 73024

Calculate the permille descent of the railway line in the section of 7.2 km by 21.6 m.

## 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
**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- right triangle
**basic functions**- per mil
- reason

### Units of physical quantities:

### Grade of the word problem:

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