# Nonagon

Calculate the area and perimeter of a regular nonagon if its radius of the inscribed circle is r = 10cm

### Correct answer:

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**Matematik**

try to start with angle 360/9 = 40°... Draw nine isosceles triangles with base a=4 cm and opposite angle 40°.

Or if you may calculate diameter of described circle - draw a circle and divide it into nine equal segments. (divide by 40° angle)

Or if you may calculate diameter of described circle - draw a circle and divide it into nine equal segments. (divide by 40° angle)

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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**- tangent

#### Units of physical quantities:

#### Grade of the word problem:

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