# Circular sector

I have a circular sector with a length of 15 cm with an unknown central angle. It is created from a circle with a radius of 5 cm. What is the central angle alpha in the circular sector?

### Correct answer:

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

**algebra**- equation
- system of equations
**planimetrics**- circle
- triangle
- circular sector
- circular arc
- circular segment
**goniometry and trigonometry**- cosine

#### Units of physical quantities:

#### Grade of the word problem:

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