# A lighthouse

A lighthouse overlooks a bay, and it is 77 meters high. From the top, the lighthouse keeper can see a yacht southward at an angle of depression of 32 degrees and another boat eastward at an angle of 25 degrees. What is the distance between the boats?

## 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
- right triangle
- triangle
**goniometry and trigonometry**- tangent

### Units of physical quantities:

### Grade of the word problem:

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