# Lesson Plans � English IV by rockandrolldreams

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Teacher –    Loren Hord                                                        Unit Name – Using Tools of Geometry
Lesson – 3.7 Constructing Points of Concurency                                 Date: 2-10-05

Today’s Goal (Standard) (Objective):

Course                                   Lesson Objectives: Apply knowledge of how to construct the
Goal 1: 2.01, 2.02,                              incenter, circumcenter and the orthocenter of any triangle.
2.03

Goal 2:

Materials: paper, pencil, compass, strait edge, computers,
Goal 3:
Geometer’s Sketchpad, Smart Board.

Warm-up Activity: Introduce Geometer’s Sketchpad and how to use
Goal 4:
the program. Review angle bisectors, perpendicular bisectors and
altitudes.
Goal 5:

Lesson: Use Geometer’s Sketchpad to first construct the incenter of a triangle from each of the
angle bisectors in it. The created concurrent point is the center of a circle that is inscribed in
the triangle.
Next construct the circumcenter from the three perpendicular bisectors of a triangle. The
result is the center of a circle that is circumscribed around a triangle.
Finally create the orthocenter of a circle from the three altitudes of a triangle. The
orthocenter is the center of gravity of a triangle.

Assessment: Previous homework.                                            Homework Assigned: Worksheet

Lesson Evaluation/Changes (reflection):
Esl/Ec Strategies:
     Visual Aids, concrete project clue, repitition, gestures
     Positive, low anxiety environment
     Simplified, slower language
     Emphasize key words/phrases with gestures, voice/pictures
     Highlight important concepts in written assignments
     Demonstrate and act out when possible
     Demonstrate graphic organizers
     Use cooperative learning strategies
     Predictable classroom procedures
     Allow sufficient/extra time
     Group assignments, portfolios, journal and non-print options
     Check for understanding
     Model cognitive strategies
     Summerize and review frequently

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