# The length 11

The length of a rectangle is four times its width. If the area is 100 m², what is the length of the rectangle?

## Correct answer:

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

**algebra**- quadratic equation
- equation
- expression of a variable from the formula
**arithmetic**- square root
**planimetrics**- area of a shape
- rectangle

### Units of physical quantities:

### Grade of the word problem:

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