Question

Use the law of cosines to find the balue of cos 0 . Round to answer to two decimal places

Answer 1

Answer:

C

Step-by-step explanation:

Using the law of cosines then cosΘ is the following quotient

cosΘ = $\frac{a^2+b^2-c^2}{2ab}$

where a = 5.8, b = 10.5 and c = 10.9

cosΘ = $\frac{5.8^2+10.5^2-10.9^2}{2(5.8)(10.5)}$

        = $\frac{33.64+110.25-118.81}{121.8}$

        = $\frac{25.08}{121.8}$ = 0.21 → C