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Geo 5-3 Proving Triangles are Congruent Video 2

Added Nov 29, 2016 •

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I set up my proof table already hopefully you guys are done that too and since I know you guys are absolute genius is you also know that the first step is always going to be given so I also went ahead and filled in my given information if you need to posit really quick because you guys did not know I was going to do go ahead and pause it and fill it in otherwise you can keep going alright it's so you're looking for SAS we are looking for one side one angle and another side congruent so that I can show the triangles are congruent  okay and when we will look here hopefully when you look at it starting to look like a the top triangle on the bottom triangle those could be congruent okay so give us two key pieces of information BCS congruent to Da and BC is congruent to ad  before we get to the formation that they get gave us is there any side that these two triangles share do they have anyone side in common hopefully are you guys are saying AC or CA they have Dockside in common it's in the middle it's true for both of them so I'm going to go ahead and write this down remember when I told you guys when we learned what's the reflexive property that it was going to become your favorite this is now when it will become your favorite remember since we're tell me about segments order doesn't matter so AC is the same thing as CA and this is called the not free flexive reflexive property  10 you should always look for the reflexive property always look for do my two triangles share a side that will be like your most basic okay now dealing with this parallel and I don't know where you guys have space I don't have a ton of space on this little tablet that I'm doing your notes on by when trying to make room we need to make a note anytime two lines are parallel we are looking for or look for alternate interior or exterior angles or you want to look same side interior angles or you want to look for corresponding angles turn so here we have two parallel lines I don't really have anything on the outside of my box so it's not going to make sense to look for any exterior angles however if I look  here and here they have to be touching the parallel lines that's why I knew not to pick the other side those two angles right there I'm looking at hats  angles DCA is Kendra is angle see  ad my reason is by alternate interior  and so now when I look at my triangle I see that I have a side that's congruent I have an angle that's congruent and then I have another side that is congruent so my final step is triangle please see is congruent to Triangle CDA and I'm actually not write the word by you can just write  side angle side  congrats and that's it I know you guys are like that's it like that's easy go ahead I want you to take a minute to talk it over with your partner I know I don't have any opportunities to answer your questions right now the talk with one another see if you guys can figure out where I'm getting all these pieces of information and why I chose those pieces especially this step right here step number 3 where I use alternate interior angles I think that's the trickiest part about this problem and while you guys are talking she can set up the next video

Uploaded by Lauren Stouffer.

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Geo 5-3 Proving Triangles are Congruent Video 2

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