Figuring Out Angle Between Two Points

[anglum]

figuring out angle?

Homework Statement

consider 2 points on a graph with coordinates (9.9m,-10m) and (-10m,1.8m)
the length of the line that intersects the two points is equal to 23.135,,, the resulting triangle has measurements of 11.9, 19.9 and 23.135.

What is the angle between the line connecting the 2 points and the x axis. measured counter clockwise. answer in units of degreess

The Attempt at a Solution

when i try to find the cos(a)=11.9/23/135 i get cos(a) = .514

when i get the sin(a)= 19.9/23.135 = .860

my batteries on my graphing calculator just crapped out on me... I am not sure what a is equal to in both those equations.. I am thinkin they might be diff values unless i am goin crazy

 

[anglum]

ooops nevermind i just got it... they were the same i was calculating with .154.. damn dyslexic habits

 

[PhanthomJay]

I believe you meant to say 11.8, not 11.9; also, it appears that the angle you are calculating is with respect to the y axis, but the problem asks for the angle with respect to the x axis.