# Diagonals 5551

The cube has a wall area of 81 cm

^{2}. Calculate the length of its edge, wall, and solid diagonals.### 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
- square (second power, quadratic)
**solid geometry**- cube
- space diagonal
- surface area
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
- diagonal

#### Units of physical quantities:

#### Grade of the word problem:

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