Practice problem
Which of the following form a linear pair?
∠2\angle{2}∠2 & ∠3\angle{3}∠3
∠1\angle{1}∠1 & ∠4\angle{4}∠4
∠1\angle{1}∠1 & ∠2\angle{2}∠2
None of the above
Type a concept, like “slope” or “photosynthesis”.
