Isosceles trapezoid v3

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

Correct answer:

α =  81 °
γ =  99 °
δ =  99 °

Step-by-step explanation:

α=β=81
γ=δ=18081=99



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