# Frustum of a cone

A reservoir contains 28.54 m

^{3}of water when complete. The diameter of the upper base is 3.5 m, while the lower base is 2.5 m. Find the height if the reservoir is in the form of a frustum of a right circular cone.## Correct answer:

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

**statistics**- geometric average
**algebra**- expression of a variable from the formula
**solid geometry**- cone
- frustum

#### Units of physical quantities:

#### Grade of the word problem:

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