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 °


Solution in text α =
Solution in text γ =

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Try conversion angle units angle degrees, minutes, seconds, radians, grads.

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