Activity Overview
Students learn to draw a segment and its perpendicular bisector. They understand right angles and congruent segments. Students observe that changing the length or orientation of the segment changes the perpendicular bisector. NCTM Geometry Standard covered: Analyze characteristics and properties of 2- and 3-dimensional geometric shapes and develop mathematical arguments about geometric relationships.
Before the Activity
Install the Cabri Jr. App on the students' graphing calculators using TI Connect™, a TI Connectivity Cable, and the Unit-to-Unit Link Cable
Set up the
TI-Navigator™ system
See the attached PDF file for detailed instructions for this activity
Print page 6 from the attached PDF file for your class
During the Activity
Distribute the page to your class.
Follow the Activity procedures:
Draw a line and its perpendicular bisector
Measure the two halves of the segment
Measure an angle formed
Change the length and position of the segment
Observe that the measurement of the segment changes but the angle measure remains 90?
TI-Navigator activity:
Use Screen Capture to observe and assess individual progress in drawing and exploring line bisectors
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary