# Ladder

How long is a ladder that touches a wall 4 meters high, and its lower part is 3 meters away from the wall?

### 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

#### Units of physical quantities:

#### Grade of the word problem:

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