Answer:
Option 2
Step-by-step explanation:
Using cosine rule for this triangle
=> [tex]a^2= b^2+c^2-2bc(Cos A)[/tex]
Where b = 2, c = 1 and A = 25
=> [tex]a^2 = 2^2+1^2 -2(2)(1)(Cos 25)[/tex]
=> [tex]a^2 = 4+1 - 4(0.906)[/tex]
=> [tex]a^2 = 5 - 3.6[/tex]
=> [tex]a^2 = 1.4[/tex]
Taking sqrt on both sides
=> a = 1.2
