# Angles by cosine law

Calculate the size of the angles of the triangle ABC if it is given by: a = 3 cm; b = 5 cm; c = 7 cm (use the sine and cosine theorem).

### Correct answer:

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The Pythagorean theorem is the base for the right triangle calculator.

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Try conversion angle units angle degrees, minutes, seconds, radians, grads.

Do you want to convert time units like minutes to seconds?

Cosine rule uses trigonometric SAS triangle calculator.

See also our trigonometric triangle calculator.

Try conversion angle units angle degrees, minutes, seconds, radians, grads.

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

**planimetrics**- Pythagorean theorem
- triangle
- The Law of Cosines
**goniometry and trigonometry**- sine
- cosine
- arccosine

#### Units of physical quantities:

#### Grade of the word problem:

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