# Trapezoid 20873

In the trapezoid ABCD (AB II CD) is α = 57 °, γ = 4β. Calculate the size of all interior angles.

### Correct answer:

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

**geometry**- line
**algebra**- system of equations
- expression of a variable from the formula
**planimetrics**- trapezoid

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