Parallel, Perpendicular, or Skew
Directions
Use the 3D figure below to determine whether the pairs of lines named in questions #1-6 are parallel, perpendicular, or skew. To help you visualize their relationship, you may want to use the line tool 
to create a line on the two given points for each line. After creating your two lines, click 
to allow you to move the figure around and get a better perspective of what is happening. Once you are done with each question, you can delete the lines you created and reset the figure by clicking on the circular arrows in the top right corner.
to create a line on the two given points for each line. After creating your two lines, click to allow you to move the figure around and get a better perspective of what is happening. Once you are done with each question, you can delete the lines you created and reset the figure by clicking on the circular arrows in the top right corner.#1
line AB and line CD
#2
line AB and line AE
#3
line AB and line CG
#4
line FB and line HD
#5
line GH and line HE
#5
line DC and line GH
#6
line HD and line GF