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Geometry 28/29 November, 2012

Geometry 28/29 November, 2012. 1) Place binder and book on your desk. 2) Do Warm Up: (back top) a) What property states that BD = BD ? b) What does CPCTC mean? c) Briefly define and sketch median. d) Draw a scalene triangle on patty paper. Construct all three medians

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Geometry 28/29 November, 2012

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  1. Geometry 28/29 November, 2012 1) Place binder and book on your desk. 2) Do Warm Up: (back top) a) What property states that BD = BD? b) What does CPCTC mean? c) Briefly define and sketch median. d) Draw a scalene triangle on patty paper. Construct all three medians by folding to find midpoints, then drawing in the medians with a pencil.

  2. median the segment connecting the vertex of a triangle to the midpoint of its opposite side median

  3. Need to come and take test TODAY P2- Vincent, Jordan, Lizeth P5- GG

  4. objective Students will apply triangle properties, triangle congruency shortcuts and CPCTC to do two-column and flow chart proof and explore polygon angle sums. Students will take notes, work independently and collaboratively and present to the class.

  5. Homework Due November 30- sign up for Khan Academy and add me as your coach Choose 5 of the topics listed on the handout and practice until you can get 10 correct (Linear Equations, Linear Functions, Polygons Triangle Congruency, Basic Triangle Proof) Shuttling Around- REVISIONS accepted through November 30th! MAKE SURE ANY CHANGES ARE EXTREMELY OBVIOUS  I don’t have time to re-read your whole project!!  (use different color, notes, etc.)

  6. SSS correspondence • ASA correspondence • SAS correspondence • AAS correspondence • HL correspondence • SSA correspondence • AAA correspondence The Congruence Shortcut Conjectures

  7. CPCTC… If two triangles are congruent, then Corresponding Parts of those Congruent Triangles are Congruent CPCTC You must make sure you have CORRESPONDING PARTS SAME RELATIVE POSITION!!! HINTS– Use colored pencils to mark corresponding parts. Mark all info you know on the figure. Redraw triangles separately, and facing the same direction. Extend lines or draw additional lines to make triangles. Use ARROWS. Finish Classwork? END OF CLASS VIDEO http://www.youtube.com/watch?feature=endscreen&v=_L8u8io6n2A&NR=1

  8. Flow Chart Proof 1. Mark known information on a sketch. 2. Start by writing the given information. 3. Write what you are trying to prove or show on the right. 4. Fill in the other boxes working backwards and forwards as needed. ASK: what do I need to know in order to claim the conclusion is true? what must I show to prove the intermediate result?

  9. Proofs– HOW? See page 237- 238 See example A- paragraph proof example B- flowchart proof Compare the paragraph proof in Ex. A with the flowchart proof in Ex. B. What similarities and differences are there? What is the advantage of each format?

  10. Finish Two Column Proof Handout Finish handout from yesterday. Think- work silently for 5 minutes Pair- check with a partner Share- whole class discussion FINISH 4.6 handout, CPCTC 1 – 9, 12

  11. The word ‘polygon’ is a Greek word. Poly means many and gon means angles. Polygons

  12. Polygons • The word polygon means “many angles” • A two dimensional object • A closed figure Polygons

  13. More about Polygons • Made up of three or more straight line segments • There are exactly two sides that meet at each vertex • The sides do not cross each other Polygons

  14. Examples of Polygons Polygons

  15. These are not Polygons Polygons

  16. Terminology Side: One of the line segments that make up a polygon. Vertex: Point where two sides meet. Polygons

  17. Vertex Side Polygons

  18. Interior angle: An angle formed by two adjacent sides inside the polygon. • Exterior angle: An angle formed by two adjacent sides outside the polygon. Polygons

  19. Exterior angle Interior angle Polygons

  20. WRITE THIS IN YOUR NOTES Exterior angle Vertex Side Diagonal Interior angle Polygons

  21. B A C F 1 2 E D Y An exterior angle of a polygon is formed by extending one side of the polygon. Angle CDY is an exterior angle to angle CDE Exterior Angle + Interior Angle of a regular polygon =1800 Polygons

  22. 1200 600 1200 600 600 1200 Polygons

  23. Is there a connection between the number of sides, the number of triangles and the sum of the measures of the angles in a polygon? Work with your group to complete Polygon Angle Sum Measures Polygons

  24. No matter what type of polygon we have, the sum of the exterior angles is ALWAYS equal to 360º. Sum of exterior angles = 360º Polygons

  25. Polygons

  26. debrief What patterns did you notice with polygon interior angles? What patterns did you notice with polygon exterior angles?

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