a² = 2-2cos120
a = √(3) units.
(2/sin30) = (√(3)/sinb)
b = 25.6589062733°
c = 180-30-b
c = 124.3410937267°
d² = √(3)²+2²-2*2√(3)cos124.3410937267
d = 3.3027756377 units.
e² = 3.3027756377²+1-2*3.3027756377cos60
e = 2.9335219916 units.
(2.9335219916/sin60) = (1/sinf)
f = 17.1705468636°
Therefore, the required angle, Beta is;
b+f
= 25.6589062733+17.1705468636
= 42.8294531369°
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