Question

In the right triangle shown, m A = 30° and AB = 12V3.

х
B
30
123
A
How long is AC?

Answer 1

∴
`Cos A=(AC)/(AB)`

➛
`Cos30=(x)/(12√(3) )`

➛
`(√(3) )/(2) =(x)/(12√(3) )`

➛
`x=12√(3)*(√(3) )/(2)`

➛
`x=18` ✓

➛
`AC=18` ✓

----------------------

hope it helps...

have a great day!!