Geometry, Teacher\'s Edition

(Axel Boer) #1

  • Students will use AAA and AA with indirect measurement to solve problems.

  • Students will share their understanding in their written work.

  • Students will explain their thinking in small groups.


IV.NotesonAssessment



  • Assess each diagram to assess student understanding.

  • Are the triangles similar?

  • Are they labeled correctly?

  • Was a proportion used to solve for the height of the tree?

  • Then assess student writing.

  • Is student thinking clear?

  • Offer notes/feedback.


Similarity by SSS and SAS


I.SectionObjectives



  • Use SSS and SAS to determine whether triangles are similar.

  • Apply SSS and SAS to solve problems about similar triangles.


II.ProblemSolvingActivity-TriangleJeopardy



  • To play this game, divide students into small groups.

  • To prepare this game, use a set of index cards and write one of the ways to prove similarity among triangles
    on each card.

  • You should have cards that say SSS, SAS, AA and AAA

  • Be sure that you have several of each card and mix them up.

  • Each student in the group takes a turn.

  • The student selects a card.

  • Then he/she must come up with an example that illustrates the way to prove similar triangles.

  • Each team can have 1 helpful hint- that is from you, and 1 lifeline from their group.

  • If the student completes the challenge correctly, the team receives a point.

  • You can play this game for quite a while.

  • Some variations can include scale factor or diagrams on the board and then the group needs to show how the
    triangles are similar.


III.MeetingObjectives



  • Students will use and apply the SSS and SAS when determining whether triangles are similar.

  • Students will use and apply the SSS and SAS to solve problems about similar triangles.

  • Students will explain their work verbally and through diagrams.


IV.NotesonAssessment



  • Assessment comes through the process of the game.

  • Because students work individually, you will have a really good idea of who understands about similar
    triangles and who needs more assistance.

  • Provide coaching/feedback when necessary through “helpful hints.”


5.7. Similarity

Free download pdf