# Circumscribed 22713

Calculate the circumference and the area of a regular ten-angle polygon if the radius of the circumscribed circle r = 20 cm.

## Correct answer:

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

**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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