# Three parallels

The vertices of an equilateral triangle lie on three different parallel lines. The middle line is 5 m and 3 m distant from the end lines. Calculate the height of this triangle.

### Correct answer:

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

**geometry**- line
**algebra**- quadratic equation
- equation
- system of equations
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
**basic functions**- reason

#### Units of physical quantities:

#### Grade of the word problem:

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