VB2010 - Calculating Angle between 2 lines.

[surya]

Hi,

I have two lines with following coordinates

Line1 :
Start Point: (10,6)
end Point: (10,12)

Line 2:
Start Point: (10,9)
end Point: (14,9)

I will be thankful for any help on calculating the angle between 2 lines.

thanks