# MO Z7–I–6 2021

In triangle ABC, point D lies on the AC side and point E on the BC side. The sizes of the angles ABD, BAE, CAE, and CBD are 30°, 60°, 20°, and 30°, respectively. Find the size of the AED angle.

### Correct answer:

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

**geometry**- line
- similarity of triangles
**algebra**- equation
- expression of a variable from the formula
**planimetrics**- right triangle
- triangle

#### Units of physical quantities:

#### Themes, topics:

#### Grade of the word problem:

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