Question

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

Answer 1

C

Explanation:

Using the law of cosines then cosΘ is the following quotient

cosΘ =
`(a^2+b^2-c^2)/(2ab)`

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

cosΘ =
`(5.8^2+10.5^2-10.9^2)/(2(5.8)(10.5))`

=
`(33.64+110.25-118.81)/(121.8)`

=
`(25.08)/(121.8)` = 0.21 → C