# Regular quadrangular pyramid

The height of the regular quadrangular pyramid is 6 cm, and the length of the base is 4 cm. What is the angle between the ABV and BCV planes? ABCD is the base, V is the vertex.

## Correct answer:

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

**algebra**- expression of a variable from the formula
**arithmetic**- square root
**solid geometry**- pyramid
**planimetrics**- right triangle
- triangle
**goniometry and trigonometry**- sine
- cosine
- tangent
- arctangent

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