# Regular 5-gon

Calculate the area of the regular pentagon with side 7 cm.

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**planimetrics**- right triangle
- polygon
- area of a shape
- triangle
**numbers**- real numbers
**goniometry and trigonometry**- sine
- cosine
- tangent
- cotangent

#### Units of physical quantities:

#### Grade of the word problem:

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