# An Elizabethan collar

An Elizabethan collar is used to prevent an animal from irritating a wound. The angle between the opening (diameter 6 inches) with a 16-inch diameter and the side of the collar is 53 degrees. Find the surface area of the collar shown.

### Correct answer:

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

**solid geometry**- cone
- surface area
- frustum
**planimetrics**- triangle
- circular arc
**numbers**- fractions
**goniometry and trigonometry**- cosine
- tangent

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