Geometry, Two Column Proofs of Angles - Addition, Substitution & Transitive Property

This geometry video tutorial provides a basic introduction into two column proofs with angles. It covers the addition and subtraction property of equality as well as the substitution and transitive property of congruence. It also covers vertical angles, angle supplements and more. This video contains plenty of examples and practice problems on angle proofs.

Geometry Introduction:

Addition & Subtraction Equality Property:

Multiplication & Division Property Equality:

Transitive Property of Congruence:

Triangles - Basic Introduction:

Alternate Interior & Exterior Angles:

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2 Column Proofs of Congruent Segments:

2 Column Proofs of Angles:

Triangle Congruence - SSS, SAS, ASA:

CPCTC - 2 Column Proofs With Triangles:

Median of a Triangle Formula:

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Final Exams and Video Playlists:

Full-Length Videos and Worksheets:

[bangobuck]

YouTube videos on the night before my test

[hkvillarreal]

This helped me so much. I’m about to take a test on this and I literally didn’t get it until now

[nolan__c]

This is a great video for last minute studying, great job!

[ZLAWGER]

hey man im autistic and no one has really shown me a better way then how you do it and youve taught me alot thank you

[matheusnguyen]

It may have been 3 years but I hope you know how much this helped me. I am still very confused but now I know more walking into the test tomorrow. i really appreciate this simple, easy to understand video!
Edit: 39/40 on the test with this and a night of suf-I mean studying

[akaashiseyebrows]

i hate geometry.. ugh this is helping me a lot but i’m still so confused 😔✊🏼

[nix]

Not only was this very helpful, but your voice is quite soothing, but not boring.
Thank you, this really helped

[allisontate]

This is the only video on proofs that actually helped me

[Brooklynemig]

Bro saved my life last year in algebra and now is doing it again in geometry

[georgesadler]

MR. Organic Chemistry Tutor, thank you for another excellent video/lecture on Geometry Two Column Proofs of Angles- Addition, Substitution and Transitive Property. Learning the two column proofs can also be confusing, however constant practice and memorizing theorems and definitions are very helpful.

[NSNick]

I thought it was gonna ne khan academy 😭😢

[remidrawsstuff]

I HAVE A GEOMETRY TEST LATER, THIS IS SO MUCH HELP THANK YOUUU

[sb-uvcj]

can this also be called a congruent supplements theorem: two angles that are supplementary to the same angle are congruent?

[mennah]

your videos are really helpful to me, thank you!

[midalorian]

that was extremely helpful :) thank you so much for your help. i not sure if i did this right but i was solving the second question on my own and got a different answer hence you could not automatically assume that 2 is congruent to 3 from 1 being congruent to 4 even though it may be common sense to automatically assume that it doesn’t prove that with any actual reasoning, what i did for that problem was i put all the givens then i set angle one plus angle two equal to angle three plus angle four, using the supplement theorem. then you would substitute the four out for the three making it angle one plus angle two equals angle one plus angle three, lastly you would just get rid of the ones because there congruent. and you would get the final answer of angle two is congruent to angle three :) i know there are multiple ways to solve it but i don’t think that the said problem was explained well enough just jumping from angle 1 is congruent to angle 4 then assuming that angle 2 is congruent to angle 3

[angelinat.]

I have a question. Don't the lines have to be parallel for <1 to be congruent to <4?

[lazy_doormat]

I needa watch this because I have a long test tomorrow! I’m starting to kind of understand

[Mrose]

Your channel is so awesome for my science and math classes. Special place in heaven for you omg

[computerprompt]

9:37, step three, the reason " angle addition" you can also classify it as "the whole is equal to the sum of it's parts" based on what state you're in!

[ellarose]

A wonderful and simple explanation. Thanks!