SOLUTION: https://media.glynlyon.com/g_geo_2012/3/page41b.gif The image is provided in the url above. Ok so I eliminated 2 answers that I think is wrong because <1 and <3 isn't vertical

Algebra ->  Angles -> SOLUTION: https://media.glynlyon.com/g_geo_2012/3/page41b.gif The image is provided in the url above. Ok so I eliminated 2 answers that I think is wrong because <1 and <3 isn't vertical       Log On


   

Question 761374: https://media.glynlyon.com/g_geo_2012/3/page41b.gif
The image is provided in the url above.
Ok so I eliminated 2 answers that I think is wrong because <1 and <3 isn't vertical or corresponding (I tried looking it up on math is fun .com or something.) But I looked and look and the only answers left are supplementary angles and complementary angles.
Question: <1 and <3 are _________ angles.
Thank you for your help can you please explain!!!
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

If a line intersects two other lines, then it is called a traversal, and there are a total of 8 angles formed. Four of the angles are called interior angles, and four of the angles are called exterior angles.
In the 3 lines in your graph, line t is the traversal of lines l and m, and the interior angles are 3, 4, 5 and 6, while the exterior angles are 1, 2, 7 and 8.
there are several angle relationships, namely:
angle 2 is equal to angle 3
angle 1 is equal to angle 4
angle 5 is equal to angle 8
angle 6 is equal to angle 7
angle 2 is equal to angle 6
angle 4 is equal to angle 8
angle 3 is equal to angle 7
angle 1 is equal to angle 5
since angles 1 and 3 form a straight line, then they add to 180 degrees; so, they are supplementary angles