# Cosine

Cosine and sine theorem:

Calculate all missing values from triangle ABC.

c = 2.9 cm; β = 28°; γ = 14° α =? °; a =? cm; b =? cm

Calculate all missing values from triangle ABC.

c = 2.9 cm; β = 28°; γ = 14° α =? °; a =? cm; b =? cm

### Correct answer:

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Cosine rule uses trigonometric SAS triangle calculator.

See also our trigonometric triangle calculator.

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

**algebra**- expression of a variable from the formula
**planimetrics**- triangle
- The Law of Cosines
- The Law of Sines
**goniometry and trigonometry**- sine
- cosine

#### Units of physical quantities:

#### Grade of the word problem:

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