Question

In the right triangle above, x=60. What is the length of the side AB?

Answer 1

`AB = 8`

Explanation:

Given

`x = 60`

`BC = 4`

See attachment

Required

Find AB

From the attachment, using cosine rule:

We have:

`cos\ x = (BC)/(AB)`

Make AB the subject

`AB = (BC)/(cos\ x)`

Substitute values for BC and x

`AB = (4)/(cos\ 60)`

`AB = (4)/(0.5)`

`AB = 8`