# Angle of deviation

The surface of the rotating cone is 30 cm

^{2}(with a circle base), and its surface area is 20 cm^{2}. Calculate the deviation of this cone's side from the base's plane.## 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
**solid geometry**- cone
- surface area
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
**goniometry and trigonometry**- cosine
- arccosine

### Units of physical quantities:

### Grade of the word problem:

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