# Two boats

Two boats are located from a height of 150m above the lake's surface at depth angles of 57° and 39°. Find the distance of both boats if the sighting device and both ships are in a plane perpendicular to the lake's surface.

## Correct answer:

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

**arithmetic**- absolute value
- subtraction
**planimetrics**- right triangle
- triangle
- The Law of Cosines
**goniometry and trigonometry**- sine
- cosine
- tangent
- cotangent

### Units of physical quantities:

### Grade of the word problem:

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