# Using 4

Using the law of cosines, find the measurement of leg b if the givens are B=20°, a=10, and c=15.

## Correct answer:

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

**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- triangle
- The Law of Cosines
**basic functions**- percentages
**goniometry and trigonometry**- cosine

### Units of physical quantities:

### Grade of the word problem:

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