Isosceles trapezoid v3

In an isosceles trapezoid ABCD is the size of the angle β = 123°
Determine size of angles α, γ and δ.

Correct answer:

α =  123 °
γ =  57 °
δ =  57 °

Step-by-step explanation:

β=123  α=β=123=123
β+γ=180   γ=180β=180123=57
δ=γ=57=57



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