# The truncated

The truncated rotating cone has bases with radii r1 = 8 cm, r2 = 4 cm and height v = 5 cm. What is the volume of the cone from which the truncated cone originated?

### Correct answer:

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

**geometry**- similarity of triangles
**algebra**- equation
- expression of a variable from the formula
**solid geometry**- cone
- frustum
**planimetrics**- triangle
**basic functions**- ratio

#### Units of physical quantities:

#### Grade of the word problem:

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