Posted by Mikal on Wednesday, March 26, 2008 at 7:09am.
two lines y=2x+6 and y=1.5x+1 intersect. What is the size of the acute angle at the intersection?
Ive got 59.4 degrees. Any confirmation/slight alteration?

Maths (coordinate geometry)  Reiny, Wednesday, March 26, 2008 at 8:30am
are you using the formula found here
http://planetmath.org/encyclopedia/AngleBetweenTwoLines.html ?
then the two slopes are 1.5 and 2
and tanß = │(21.5)/(1+(2)(1.5))│
tanß = 1.75
ß = 60.26º