# Isosceles trapezoid v3

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

Result

α =  81 °
γ =  99 °
δ =  99 °

#### Solution:

$α= β= 81 ^\circ$
$γ = δ = 180-81 = 99 ^\circ$

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