# Masquerade ball

Marie wants to make a cone-shaped witch's hat for a masquerade ball. How much material will it need if it counts on an annular rim with diameters of 28cm and 44cm? The hat side length is 30cm. Add 5% of the material to the bust. Round to cm

^{2}.### Correct answer:

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

**arithmetic**- rounding
**solid geometry**- cone
- surface area
**planimetrics**- circle
- area of a shape
- annulus
**basic functions**- percentages

#### Units of physical quantities:

#### Grade of the word problem:

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