Lesson 1.4.1: Congruent Criteria for triangles - SAS |
For this lesson there are 16 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 1.4.1 Worksheet
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Whole Class Warm Up
Let's do this warm up before you get started today.
Let's do this warm up before you get started today.
1.) Targets
Start your notes with the targets below:
Start your notes with the targets below:
- I can show why the SAS congruence criterion works.
- I can use the SAS shortcut in proofs.
2.) Warm Up
Follow these instructions. This warm up will help us better understand SAS.
If any of these instructions are unclear, watch the video next video.
Follow these instructions. This warm up will help us better understand SAS.
- Draw segment AB
- Draw segment BC (this should create angle ABC).
- Draw a line of reflection and call it L.
- Reflect angle ABC over line L.
- Connect points A and C to create segment AC and do the same on the image with A' and C'.
- Is AC congruent to A'C'?
- Are triangles ABC and A'B'C' congruent?
- Before we connected AC and A'C' we just had two angles. What congruencies did we start with?
If any of these instructions are unclear, watch the video next video.
3.) Video: Warm Up
Here I follow the steps and answer the questions from the warm up. |
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4.) Video: Vocab
Take notes on this video. Make sure to have all the vocab written down and make sure you understand the vocab. |
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5.) Video: Proving SAS with Sequence of Rigid Motions
Here we prove the SAS shortcut as a viable argument using rigid motions. |
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6.) Video: Function Notation of SAS
Here we learn how to write a sequence of rigid motions in a more simple format of function notation. |
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9.) Video: Practice 1
Only watch this video AFTER you have attempted it on your own first. |
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11.) Video: Practice 2
If you have attempted this on your own, watch this video to compare with my work. |
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13.) Video: Practice 3
Watch this video IF you have already attempted this problem on your own. |
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