Let the congruent lengths be 1 unit.
(1/sin50) = (a/sin80)
a = 1.28557521937 units.
sin(60) = b/2
b = √(3) units.
b = 1.73205080757 units.
c = 20°
d² = 1.73205080757²+1.28557521937²-2*1.73205080757*1.28557521937cos20
d = 0.68404028665 units.
Therefore, the required angle is;
Let it be e.
(0.68404028665/sin20) = (1.28557521937/sine)
e = 40°
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