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105+30 = 135°
para llegar a 180° te faltan 45°
entonces C= 45°
entonces :
a b
------- = -------
senA senB
a 20
-------- = -----------
sen30° sen105°
a= 20
---------- x sen30°
sen105°
a= 9.10 km
haces lo mismo con c
b c
--------- = ---------
senB SenC
20 c
-------- = -----------
sen105° sen45°
20
---------- x sen45 = c
sen105°
13.029 km = c