# Viewing angle

The observer sees a straight fence 60 m long at a viewing angle of 30°. It is 102 m away from one end of the enclosure. How far is the observer from the other end of the enclosure?

## Correct answer:

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

**algebra**- quadratic equation
- 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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