# Pentagonal pyramid

The height of a regular pentagonal pyramid is as long as the edge of the base, 20 cm. Calculate the volume and surface area of the pyramid.

### 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
- surface area
**planimetrics**- Pythagorean theorem
- right triangle
- polygon
- area of a shape
- perimeter

#### Units of physical quantities:

#### Grade of the word problem:

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