# Parallelogram 65954

In the parallelogram ABCD AB = 8, BC = 5, BD = 7. Calculate the magnitude of the angle α = ∠DAB (in degrees).

### 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
- parallelogram
**numbers**- fractions
**goniometry and trigonometry**- cosine

#### Units of physical quantities:

#### Grade of the word problem:

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