By definition, the alternate interior angles are those that can be seen in the internal part of the parallel alternated to the sides of the secant line that crosses them, while alternate exterior angles are outside the parallels and located on both sides of the parallel, separated in turn by the transversal line.
Alternative angles
Alternate angles are a set of nonadjacent angles on both sides of a transversal. It intersects two lines (generally parallel) forming eight angles that can be classified as alternate external or alternate internal.
Alternate interior angles and alternate exterior angles
Then:
- The alternate interior angles are those that can be seen in the internal part of the parallel alternated to the sides of the secant line that crosses them. That is, alternate interior angles are those that are on the opposite side of the parallels and on the opposite side of the transversal.
- Alternate exterior angles are outside the parallels and located on both sides of the parallel, separated in turn by the transversal line. That is, alternate external angles are those that are on the outside of the parallels, on a different side of them and on a different side of the transversal.
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