Question

Can someone please answer this for me

Answer 1

BC = 1.7

Explanation:

Since, cosine of any angle (except right angle) represents the ratio of base length and hypotenuse.

Cosθ =
`\frac{\text{Base}}{\text{Hypotenuse}}`

From the given right triangle ΔACB,

`\text{Cos}(\angle B) = \frac{\text{Base}}{\text{Hypotenuse}}`

`=(BC)/(AB)`

Cos(70°)
`=(BC)/(5)`

BC = 5Cos(70°)

= 1.71

≈ 1.7