# Triangle ABC

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

a) rectangular

b) acute-angled?

a) rectangular

b) acute-angled?

### Correct answer:

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Pythagorean theorem is the base for the right triangle calculator.

Cosine rule uses trigonometric SAS triangle calculator.

See also our trigonometric triangle calculator.

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