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# Alternate Interior Angles - Concept

###### Brian McCall

###### Brian McCall

**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.

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###### Brian McCall

B.S. in Chemical Engineering, University of Wisconsin

J.D. University of Wisconsin Law School (magna cum laude)

He doesn't beat around the bush. His straightforward teaching style is effective and his subtle midwestern accent is engaging. There's never a dull moment with him.

so my teacher can't explain this in 5 weeks but I learn this in less than 3 minutes”

its hard to focus when the teacher is really really really goodlooking”

i like how it took you 3 minutes and 8 seconds to accomplish what my teacher couldn't in 3 days”

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