# Determine 81311

The surface of the rotating cone and its base area is in the ratio 18:5. Determine the volume of the cone if its body height is 12 cm.

## 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
**arithmetic**- square root
**solid geometry**- surface area
- frustum
**planimetrics**- Pythagorean theorem
- area of a shape
**basic functions**- ratio
**numbers**- fractions

#### Units of physical quantities:

#### Grade of the word problem:

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