2/8 Geometry Bell Ringer 1.Mr. Chrischilles made chili for his Super Bowl Party. The recipe called for 2 cans of chili beans in order to serve 5 people.

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Presentation transcript:

2/8 Geometry Bell Ringer 1.Mr. Chrischilles made chili for his Super Bowl Party. The recipe called for 2 cans of chili beans in order to serve 5 people. If Mr. Chrischilles needed to serve 20 people? (Set up proportion to solve) 2.What were the 4 Congruent Triangle Postulates (shortcuts) that we used to prove triangles were congruent? Homework: Identifying Similar Triangles Indep. Practice

2/8 News and Notes Perfection Award: 1 st Period HW Checked? Tardy Policy Reminder Remember, Quiz Friday!

Today = A College Test Today is going to be different. Quick story about Prof. Chamlee-Wright 1. We will have a discussion for minutes  I will pose questions, you will offer your thoughts. 2. Eventually you won’t need to raise your hands, but today you will as we adapt. 3. Constructive Criticism: “I disagree, it seems to me that is true.” 4. EVERY COMMENT is VALUABLE 5. Today I’ll write important stuff on board, eventually I won’t need to do this. You’ll write in your notes and you’ll be able to use your notes on the 2 question quiz after class.

Remember our new rules: 1. Give Respect, Get Respect – Constructive Criticism 2. Be on time and start bell ringer right away 3. Prepared means binder, homework, pen/pencil, and handouts for today are ready. 4. “I Can” not “I Can’t” 5. Quiet when others are talking

Questions driving conversation: From the bell ringer, what were our 4 postulates/shortcuts from Congruent Triangles? What’s the difference between congruent triangles and similar triangles? Are congruent triangles still similar? What’d we say about AAA for congruent triangles? Do we have to show all 3 angles, or can we make similarity conclusion with fewer, why? AA Similarity Postulate: What is then guaranteed to be true about sides?

More Questions So we’ve used the angle portion of our definition, what’s the other part of the definition of similar triangles? If you knew that the three sides were proportional, what would be true about the angles? Why? SSS Postulate: Example.

More What other congruent triangle postulates were there besides SSS? Why do we not need to talk about SAA or ASA? SAS Postulate Example SSA still doesn’t work, why?

One Example, One Non-Example 1.Shortcut SAS 2. Does it work to prove? YES 3.Do proportions work? 24 = 24

One Example, One Non-Example 1.Shortcut SSS 2. Does it work to prove? YES 3.Do proportions work? 6 = 18

Independent Practice 5 examples, one non-example 3 steps: –1. Identify shortcut  Put in box –2. Check proportions if sides involved –3. If similar, state similar triangles.

2 Question Quiz