# Rotating 7947

In the rotating cone = 100π

S rotating cone = 90π

v =?

r =?

S rotating cone = 90π

v =?

r =?

### Correct answer:

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

**algebra**- quadratic equation
- system of equations
- expression of a variable from the formula
- biquadratic equation
**arithmetic**- square root
- square (second power, quadratic)
**solid geometry**- cone
**planimetrics**- circle

#### Units of physical quantities:

#### Grade of the word problem:

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