Question

What expressions can be used to find bac? Check all that apply

Answer 1

i would say A and C
Hope thats right helps

Answer 2

Options A and D.

Explanation:

It is given in the question

Side AC = 6.9 cm

side BC = 9.8 cm

side AB = 12 cm

Let ∠BAC = x

We can find this angle x by applying sine and cosine rule in the given right angle triangle ABC

sinx =
`\frac{\text{opposite side}}{\text{Hypotenuse}}=(BC)/(AB)`

=
`(9.8)/(12)`

`x = sin^(-1)[(9.8)/(12)]`

Now we apply cosine rule

cosx =
`\frac{\text{Adjacent side}}{\text{Hypotenuse}}`

=
`(6.9)/(12)`

x =
`cos^(-1)((6.9)/(12) )`

Therefore, options A and D are the correct options.