# Lampshade

The cone-shaped lampshade has a diameter of 30 cm and a height of 10 cm. How many cm

^{2}of material will we need when 10% is waste?## 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**- cone
**planimetrics**- Pythagorean theorem
- right triangle
- area of a shape
- triangle
**basic functions**- percentages
**numbers**- fractions

### Units of physical quantities:

### Grade of the word problem:

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