# Diagonal 20

The rectangular town plaza's diagonal pathway is 20 m longer than the width. Suppose the pathway is 20 m shorter than twice the width. How long should the pathway be?

### Correct answer:

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

**algebra**- quadratic equation
- system of equations
- expression of a variable from the formula
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
- diagonal
- rectangle

#### Units of physical quantities:

#### Grade of the word problem:

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