Question

NEED some Help ASAP Plz

Answer 1

Option 2

Explanation:

Using cosine rule for this triangle

=>
`a^2= b^2+c^2-2bc(Cos A)`

Where b = 2, c = 1 and A = 25

=>
`a^2 = 2^2+1^2 -2(2)(1)(Cos 25)`

=>
`a^2 = 4+1 - 4(0.906)`

=>
`a^2 = 5 - 3.6`

=>
`a^2 = 1.4`

Taking sqrt on both sides

=> a = 1.2