# Triangle ABC

Triangle ABC has side lengths m-1, m-2, and m-3. What has to be m to be a triangle

a) rectangular

b) acute-angled?

a) rectangular

b) acute-angled?

## Correct answer:

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

**algebra**- quadratic equation
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
- The Law of Cosines
**basic functions**- reason

### Units of physical quantities:

### Grade of the word problem:

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