# Math Help - which is greater col a or col b

1. ## which is greater col a or col b

[IMG]file:///C:/Users/Neo/AppData/Local/Temp/moz-screenshot.jpg[/IMG]

Col A: AB
Col B: BC

2. Originally Posted by bluffmaster.roy.007
[IMG]file:///C:/Users/Neo/AppData/Local/Temp/moz-screenshot.jpg[/IMG]

Col A: AB
Col B: BC
If we drop a perpendicular from B to the midpoint of AC which I will call D we can treat the left triangle as a right-angled triangle with hypotenuse AB

$cos(30) = \frac{\sqrt{3}}{2} = \frac{Adjacent}{Hypotenuse}$

The adjacent is $AD = \frac{1}{2}AC = 3$

Once you know AC you can find out BC using the cos rule

3. Originally Posted by bluffmaster.roy.007

Col A: AB
Col B: BC
Unfortunately, since they give us only one angle and one side, we cannot conclude much of anything -- unless we assume that the figure is "to scale", which usually you are not supposed to.