# Cosine

Cosine and sine theorem:

Calculate all missing values (sides and angles) of the triangle ABC.

a = 20 cm; b = 15 cm; γ = 90°; c =? cm; α =? °; β =? °

Calculate all missing values (sides and angles) of the triangle ABC.

a = 20 cm; b = 15 cm; γ = 90°; c =? cm; α =? °; β =? °

### 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
**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
- The Law of Cosines
- The Law of Sines
**basic functions**- percentages
**physical quantity**- unit conversion
- time
- angle
**numbers**- fractions
**goniometry and trigonometry**- sine
- cosine
- arcsine

#### Level of the problem:

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