Calculating Alpha, let it be x.
Let the equal lengths be 1 unit each.
a = 180-30-40
a= 110°
(1/sin30) = (b/sin40)
b = 2sin40
b = 1.28557521937 units.
c² = 1.28557521937²+1²-2*1.28557521937*1cos30
c = 0.65270364466 units.
Calculating x, Alpha.
(0.65270364466/sin30) = (1/sinx)
sinx = sin30/0.65270364466
x = asin(0.5/0.65270364466)
x = 50°
Again, x is Alpha.
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