# Rectangle 3-4-5

The sides of the rectangle are in a ratio of 3:4. The length of its diagonal is 20 cm. Calculate the area of the rectangle.

### 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
**planimetrics**- Pythagorean theorem
- right triangle
- area of a shape
- triangle
- diagonal
- rectangle
**basic functions**- ratio
- direct relationship

#### Units of physical quantities:

#### Grade of the word problem:

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