# Children playground

The playground has a trapezoid shape, and the parallel sides have a length of 36 m and 21 m. The remaining two sides are 14 m long and 16 m long. Find the size of the inner trapezoid angles.

### 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**- right triangle
- triangle
- trapezoid
- The Law of Cosines
- The Law of Sines
- parallelogram
**goniometry and trigonometry**- sine
- cosine

#### Units of physical quantities:

#### Grade of the word problem:

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