Answer:
[tex]AB = 8[/tex]
Step-by-step explanation:
Given
[tex]x = 60[/tex]
[tex]BC = 4[/tex]
See attachment
Required
Find AB
From the attachment, using cosine rule:
We have:
[tex]cos\ x = \frac{BC}{AB}[/tex]
Make AB the subject
[tex]AB = \frac{BC}{cos\ x}[/tex]
Substitute values for BC and x
[tex]AB = \frac{4}{cos\ 60}[/tex]
[tex]AB = \frac{4}{0.5}[/tex]
[tex]AB = 8[/tex]
