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Lesson Plan for SD 3.2 (50 minutes): Target: I can draw triangles with specific criteria. 5 minutes 25 minutes 10 minutes 10 minutes 5 minutes Warm-up (notebook) Launch video and model at least one construction (you may find that you need to model more, depending on the class – it’s really tough for them to put together all of these pieces.) Discuss the pattern for how much information is needed to draw a triangle that is an exact copy (it may help to tell them that this is a preview of geometry in 10th grade – encourage them to focus on being able to draw triangles with specific criteria.) It’s great if you can have them share triangles that they drew that have the same criteria, but look different than the original triangle (so they can see there are multiple ways to draw some of them). Exit Ticket Reminders: • Correct homework with key (puzzle) Investigation 2 : The Angle Connection SD 3.2 Design Challenge Learning Target: I can identify what side lengths make a triangle. Homework: Day 3 SD 3.2 Complete p. 9 and CORRECT with the KEY Warm-up: Complete in your journal or Inv. Packet! Emma says that you can make a triangle with any three side lengths. (Remember Building Triangles Yesterday) Do you agree or disagree? Explain your reasoning and provide an example to prove your thinking. Review Concepts! • What’s a compliment of a 60 degree angle? • What’s a supplement of a 60 degree angle? • How do I draw a triangle with side AB=1in, Angle ABC=45 degrees, and side BC=2in? Problem 3.2: Which of these short messages give enough information to draw a triangle congruent to ABC? Angle Side Angle Side Angle Side Angle Angle Angle 5. 3. Angle Angle Side Side Side Angle p. 8 What minimum information about a triangle allows you to draw exactly one triangle? You need to have at least ______________ sides and/or three angle measurements – but _________ butnot notany any three sides and/or angles. three side lengths You can make a unique triangle with ________ side lengths or with ________ angles and ____________ side length. two angles one side length. Complete: EXIT TICKET #2 (two sides) Investigation 2 : The Angle Connection SD 3.2 Design Challenge Did I reach my Learning Target? I can identify what side lengths make a triangle. Homework: Day 3 SD 3.2 Complete p. 9 and CORRECT with the KEY
