# Angle of two lines

There is a regular quadrangular pyramid ABCDV; | AB | = 4 cm; height v = 6 cm. Determine the angles of lines AD and BV.

### Correct answer:

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

**geometry**- line
**solid geometry**- pyramid
**planimetrics**- right triangle
- triangle
- square
- quadrilateral
**goniometry and trigonometry**- tangent
- arctangent

#### Units of physical quantities:

#### Grade of the word problem:

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