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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