# 30-gon

At a regular 30-gon, the radius of the inscribed circle is 15cm. Find the side length a, circle radius R, circumference, and area.

### 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**- cosine

#### Units of physical quantities:

#### Grade of the word problem:

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