Like what you saw?
Create FREE Account and:
- Watch all FREE content in 21 subjects(388 videos for 23 hours)
- FREE advice on how to get better grades at school from an expert
- FREE study tips and eBooks on various topics
Alternate Interior Angles - Concept
Univ. of Wisconsin
J.D. Univ. of Wisconsin Law school
Brian was a geometry teacher through the Teach for America program and started the geometry program at his school
Alternate interior angles are formed by a transversal intersecting two parallel lines . They are located between the two parallel lines but on opposite sides of the transversal, creating two pairs (four total angles) of alternate interior angles. Alternate interior angles are congruent, meaning they have equal measure.
When we have two parallel lines that are intersected by a transversal, and again my parallel lines are identified by using the same number of arrows, then two special angles are congruent and that is alternate interior angles. So let's examine these two words, alternate means on opposite sides, interior means within or in between. So here we have our two parallel lines, our alternate interior angles are going to be the angles that are inside and on opposite sides of the transversal. So angle 4 is inside and its opposite side would be 6 so those two angles will be congruent. There's only one other pair of alternate interior angles and that's angle 3 and its opposite side in between the parallel lines which is 5.
So alternate interior angles will always be congruent and always be on opposite sides of this transversal.
Please enter your name.
Are you sure you want to delete this comment?