# Isosceles trapezoid v3

In an isosceles trapezoid ABCD is the size of the angle β = 81°
Determine size of angles α, γ and δ.

α =  81 °
γ =  99 °
δ =  99 °

### Step-by-step explanation:

$\alpha =\beta =81\text{°}$
$\gamma =\delta =180-81=99\text{°}$

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