Question

What is the answer of a ?

Answer 1

2.2

Explanation:

Use the cosine law (look at the picture).

We have:

`a=a\\b=4\\c=3\\\gamma=32^o`

`a^2=4^2+3^2-2(4)(3)\cos32^o`

`\cos32^o\approx0.848` → look at the second picture

`a^2=16+9-24(0.848)\\\\a^2=25-20.352\\\\a^2=4.648\to a=√(4.648)\\\\a\approx2.2`