# Two forces 3

Two forces with magnitudes 8 Newtons and 15 Newtons act at a point. If the resultant force is 17 Newtons, find the angle between the forces.

### 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**- triangle
- The Law of Cosines
**goniometry and trigonometry**- cosine
- arccosine

#### Themes, topics:

#### Grade of the word problem:

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