Question 1017292

Find the perimeter of the triangle with the vertices at 

(1, 2), (-6, 5), and (-6, -4). 
<pre>You need to use the distance formula to find the length of the line connecting points (1, 2) & (- 6, 5), and (1, 2) & (- 6, - 4). 

You do not need to do this for the line connecting (- 6, 5) and (- 6, - 4) since these points' x-coordinates are the same, hence a vertical line
that's parallel to the y-axis. This length is found by merely taking the absolute value of the difference between the y-coordinates.
This is: either: {{{abs(5 - - 4)}}}, or {{{abs(- 4 - 5)}}}. You could also subtract the smaller value (- 4) from the larger value (5). 
Do you now see the length of this side? I sure hope so!