# Two balls

Two balls, one 8cm in radius and the other 6cm in radius, are placed in a cylindrical plastic container 10cm in radius. Find the volume of water necessary to cover them.

## Correct answer:

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

**arithmetic**- square root
**solid geometry**- cylinder
- sphere
- space diagonal
**planimetrics**- Pythagorean theorem
- right triangle
- triangle
- diagonal
**numbers**- fractions

### Units of physical quantities:

### Grade of the word problem:

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