# Loonie

Loonie has three wooden sticks measuring 17 inches, 21 inches, and 25 inches. He lays them down to form a triangle. Find the measure of the angle enclosed by 17 inches and 21 inches. (Express answers to the nearest hundredths) (using the law of cosines)

## 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
**planimetrics**- Pythagorean theorem
- triangle
- The Law of Cosines
**numbers**- fractions
**goniometry and trigonometry**- cosine
- arccosine

### Units of physical quantities:

### Grade of the word problem:

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