Question

Solve for A ?

Anyone willing to help me :)

Answer 1

2.2

Explanation:

Use the cosine law:

`BC^2=AB^2+AC^2-2(AB)(AC)\cos(\angle A)`

We have:

`BC=a\\\\AB=4\\\\AC=3\\\\m\angle A=32^o\to\cos32^o\approx0.848`

Substitute:

`a^2=4^2+3^2-2(4)(3)(0.848)\\\\a^2=16+9-20.352\\\\a^2=4.648\to a=√(4.648)\\\\a\approx2.2`