Tiffany
Dawdy
CAMELBACK HIGH SCHOOL,
PHOENIX,
AZ

12th Grade Math :
Unit #6 - Conic Sections :
Lesson #9

Objective:
SWBAT graph parabolas from both vertex form and standard form.

1 Warm-up: Silent Board Game -
15 minutes

To start class today and help students warm up, we are going to do a Silent Board Game. The directions for a Silent Board Game are on page 2 of the Flipchart. The problem is Page 3.

I predict that the game will take about 10-15 minutes. I think it is valuable to have students persevere through the task. In a silent board game, the teacher isn’t supposed to step in and help at all, other than erasing incorrect work and leaving correct work. Today, I may need to step in to help students factor out the 25 from the y and y squared terms. In a case like this, I normally let three students come up and do it incorrectly and then I will step in to help.

I may also give some feedback as I erase. Things like, “we can’t do ____ because _____.” I actively support students who take the risk to struggle in front of the class. I believe many other students probably wanted to make the same move. It is important to see it on the board. However, time management is important. When I start to feel time is being wasted, I step in and give a hint to help the problem solving process keep moving.

resources

Flipchart - parabolas on paper(p.1-3).pdf

https://betterlesson.com/lesson/resource/2222882/flipchart-parabolas-on-paper-p-1-3-pdf
Flipchart - parabolas on paper.flipchart

https://betterlesson.com/lesson/resource/2222883/flipchart-parabolas-on-paper-flipchart
2 Brain Dump: Parabolas -
5 minutes

To help students recall all of things that they know about parabolas, I ask students to text in one fact they know about parabolas. I encourage them to identify facts that they can use to solve problems with parabolas. I allow students to take out their Parabolas Summary sheet from yesterday and text in some facts from it if they are unable to work from memory.

After a few minutes, I will do a word seed on the Flipchart (p.4). I will dump all the responses and quickly review them as a class. I will make sure to highlight the different forms for the equation of a parabola and how we can use them.

resources

Flipchart - parabolas on paper (p.4).pdf

https://betterlesson.com/lesson/resource/2222880/flipchart-parabolas-on-paper-p-4-pdf
Parabolas Summary.docx

https://betterlesson.com/lesson/resource/2222885/parabolas-summary-docx
3 AB Partner Activity -
25 minutes

Parabola Problems with Partners, video narrative, AB partners.MP4

https://betterlesson.com/lesson/section/9878/parabola-problem-partner-critiques
resources

A-B partner activty - parabolas.docx

https://betterlesson.com/lesson/resource/2222879/a-b-partner-activty-parabolas-docx
4 Closure: Which form and when? -
5 minutes

If there is time, I want students to complete a Cliff Notes, Jr. summarizing their knowledge of the different forms of quadratic equations and when we should use each form. I encourage students to make something that would be helpful on a test. Who knows? I may even let them use it on the test.

I am not sure if I will be able to accomplish this today. Ultimately, I would rather have students spend more time debriefing their critique of each other’s work.

resources

Flipchart - parabolas on paper (p.5).pdf

https://betterlesson.com/lesson/resource/2222881/flipchart-parabolas-on-paper-p-5-pdf
5 Homework -
0 minutes

Assign Homework 4 - Conic Sections for homework tonight.

resources

Homework 4 - Conic Sections.docx

https://betterlesson.com/lesson/resource/2393355/homework-4-conic-sections-docx
Homework 4 - Conic Sections.pdf

https://betterlesson.com/lesson/resource/2553742/homework-4-conic-sections-pdf