# Pentagon

Calculate the length of a regular pentagon's side, circumference, and area, inscribed in a circle with a radius r = 6 cm.

### 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
**planimetrics**- Pythagorean theorem
- right triangle
- circle
- polygon
- area of a shape
- perimeter
- triangle
**goniometry and trigonometry**- sine

#### Units of physical quantities:

#### Grade of the word problem:

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