Geometry
Geometer’s Sketchpad Lab Activity Students:_________________________
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Section 3.2
1) Open File “Worksheet GS 3.2”. Remember to “deselect” before each procedure.
2) Select points A, B, C and choose “Measure>Angle” to display the measure
What is: m  ABC = ? ___________
Repeat this procedure to display the measure of these angles, record the measures:
m  DEF=____________, m  CBD=_________,m  MHJ=________, m  JKF=_________
3) choose point L and drag the point until the lines j and k appear parallel.
a) What do you notice about m  ABC and m  DEF ? _______________________
b) If line m is the transversal of lines j and k, what type of angle pair are  ABC and  DEF ?
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c) If you haven’t already, drag point L until m  ABC = m  DEF (or as close as you can).
d) What kind of angle pair are  CBD and  DEF ? ________________________.
e) What is m  CBD +  DEF =? ___________________________
(Note: you can use the Measure>Calculate menu, or compute by hand)
4) Choose point G and drag until lines m and n appear parallel.
a) What do you notice about m  CBD and m  GHC? _____________________
b) If line j is the transversal of lines m and n, what type of angle pair are  CBD and
 GHC?_____________________
c) Try to drag point G until m  CBD and m  GHC.
5) Sketch your final drawing. What type of figure have you created? _______________________________
6) State the converse of the Corresponding Angles Postulate.
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Do you believe it’s true? Why? __________________________________________________