Answer:
B = 54°; a ≈ 1.86; b ≈ 4.19
Step-by-step explanation:
The remaining angle is ...
B = 180° -105° -21° = 54°
The law of sines tells you the side lengths are in proportion to the sines of the angles:
a = 5·sin(A)/sin(C) ≈ 1.86
b = 5·sin(B)/sin(C) ≈ 4.19
