# Tetrahedron

What is the angle of the sides from the base of a three-sided pyramid where the sides are identical?

## 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
**solid geometry**- pyramid
**planimetrics**- right triangle
- triangle

### Units of physical quantities:

### Grade of the word problem:

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