# SAS calculation

Given the triangle ABC, if side b is 31 ft., side c is 22 ft., and angle A is 47°, find side a. Please round to one decimal.

### 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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