Consider that lines A and B are parallel. Which equation models the relationship between ∠1 and ∠5?
A) ∠1 = ∠5
B) ∠1 + ∠5 = 90°
C) ∠1 + ∠5 = 180°
D) ∠1 + ∠5 = 100°

Question

Consider that lines A and B are parallel. Which equation models the relationship between ∠1 and ∠5?
A)	∠1 = ∠5	
B)	∠1 + ∠5 = 90°	
C)	∠1 + ∠5 = 180°	
D)	∠1 + ∠5 = 100°

chpatterson · Answer

http://www.usatestprep.com/modules/gallery/files/170/17083/17083.png

will.h · Answer

hmm interesting 
Those are 2 parallel lines cut by transversel the angle 1 and 5 are certainly not alternate interior angles therefor they aren't identical therefor option A is eliminated 
and option D is just making no sense why would the sum = 100 when we don't have measures of the angles 
so leaves us with B and C 
Thoughts?

chpatterson · Answer

yeah i gessed it so i got it wrong now i have restarted

will.h · Answer

Note that angle 5 is obtuse so the sum of angle 1 and 5 cannot equal to 90 clearly so it is surely C