Given a quadrilateral with sides a = , b = , c = , and d = with opposite angles α = and γ = , calculate the area using Bretschneiders formula Practice Problem

<-- a
<-- b
<-- c
<-- d
<-- angle 1 α
<-- angle 2 γ
  

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The following practice problem has been generated for you:
Given a quadrilateral with sides a = 19, b = 19, c = 5, and d = 5 with opposite angles α = 56 and γ = 56, calculate the area using Bretschneider's formula