OBJECTIVES: Students will be able to execute a glide-reflection with an object. They will see the combined efforts of the study on reflection and on translation.
PROCEDURE:
(1) Lecture/discussion
(2) Demonstration (within lecture)
(3) Individual work on computer
LESSON/CLASSWORK:
I. BRIEF REVIEW OF YESTERDAY'S WORK
A. Single reflection, using one mirror
B. Multiple reflections, using more than one mirror
II. GLIDE-REFLECTION
A. What is Glide-Reflection?
B. What are the defining data?
(1) Mirror(s)
(2) Translation vector(s)
C. Process
(1) You can first do the reflection, then the glide, or the glide, then the reflection
(2) We will do reflection then glide
(3) Draw object
(4) Construct reflection "mirror"
(5) "Mark" mirror using command in Transform's drop-down box
(6) Highlight all of the object to be reflected
(7) Click on "Reflect" command in drop-down box
(8) Now the object should be in new position, having been reflected over the mirror
(9) Now we use our translation vector to translate the object
(10) Mark vector in the direction the translation is to take place
(11) Highlight the total object
(12) Click command "Translate" in drop-down box
(13) Now we can stop or continue on by reflecting over another mirror, then translating with same or another vector
D. Results
(1) Original object
(2) Object in new position
III. WRAP-UP
A. Regroup
B. Discuss results and other interesting findings
IV. DISMISS