Lesson 1.4.2: Base Angles and Isosceles triangles |
For this lesson there are 13 steps for you to take. Scroll down and do each step one-by-one. The instructions under each step will help clarify exactly what you need to do, so please read all the instructions.
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Here is your Lesson 1.4.2 Worksheet
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1.) Video: Targets and Vocab
Make sure to take notes on all of this. |
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4.) Video: Warm Up
Watch this video to see how I did the warm up. |
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5.) Notes: Prove Base Angles are Congruent (Transformations)
We want to first try to prove that base angles are congruent using what we know about transformations. The image to the right gives some advice on how to start. Then you try to reason your way to the understanding that base angles are congruent. |
6.) Video: Prove with Transformations
Here is my explanation of how a transformation can prove base angles are congruent. |
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8.) Video: Prove with SAS
Here is my explanation of how a SAS can prove base angles are congruent. |
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10.) Video: Practice #1
Watch me write a proof for practice #1. This might be a great video to put on double speed if you can follow it. |
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12.) Video: Practice #2
Watch me write a proof for the second practice problem. |
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