# Pentagonal pyramid

Find the volume and surface of a regular pentagonal pyramid with a base edge a = 12.8 cm and a height v = 32.1 cm.

## Correct answer:

**Showing 2 comments:**

**Sebf**

I think we should see all the variables, I mean : a, v, n S1, S2 and all the things used to finally get the result S. On the scheme.

I understand the way you calculate on your savant literature. But I 'm sure i' m not the only one who would like to learn about this science visually.

For me it's OK. But I cannot share that.

Very sad while it is very clever.

Please explain how you get the result visually on the scheme.

Thanks by advance

Regards

I understand the way you calculate on your savant literature. But I 'm sure i' m not the only one who would like to learn about this science visually.

For me it's OK. But I cannot share that.

Very sad while it is very clever.

Please explain how you get the result visually on the scheme.

Thanks by advance

Regards

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See also our right triangle calculator.

### 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

### Units of physical quantities:

### Grade of the word problem:

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