# Four sides of trapezoid

In the trapezoid ABCD is |AB| = 73.6 mm; |BC| = 57 mm; |CD| = 60 mm; |AD| = 58.6 mm. Calculate the size of its interior angles.

## Correct answer:

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

**planimetrics**- triangle
- trapezoid
- The Law of Cosines
**basic functions**- reason
**goniometry and trigonometry**- cosine
- arccosine

### Units of physical quantities:

### Grade of the word problem:

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