GEOMETER'S SKETCHPAD SKETCH THREE in VERSION 3

NOTE - - Directions for this activity in VERSION 4 are below.

For best results, follow this script line by line.  Several shortcuts are
used!  As you work through the scripts, fewer and fewer hints will be
provided.  If you have already been working on a sketch during this
session, shut down and restart the Sketchpad program to insure that your
letter labels will match the labels mentioned in this script.  Before you
print a sketch, be sure that your name and conclusions are on the sketch.

Display, Preferences, Points on
Make two points, selecting both (Should be fairly far apart)
Construct, Line
Make point C, not on line AB but not too close
Select point A and point C
Construct, Line
Select line AB and point C
Construct, Parallel
Select line AC and point B
Construct, Parallel
Select the line parallel to AB through C and the line parallel to AC 
		through B
Construct, Point at Intersection, (point D)
NOTE: you might have to adjust your sketch to have it all on the screen
Select point B, then point A, then point C
Measure, Angle BAC
Select C, then D, then B
Measure, Angle CDB
Observe the measures as you move each of the four points
Make a text box in which to type your name and conclusions

You may elect to print your sketch at this point or wait until you
complete the sketch

Continue on the same sketch
Select line AB and point C
Construct, Perpendicular
Select the new perpendicular line and line AB
Construct, Point at Intersection, making point E
Select all five lines
Display, Hide all five lines
Construct, Segments AB, BD, CD, AC, and CE
Select segment CE
Measure, Length
Using the "Hand" tool, double click on the length of CE
Text Format, Change "Length(Segment EC)" to HEIGHT, click OK
Select segment AB
Measure, Length
Using the "Hand" tool and double click on the listed length of AB
Text Format, Change "Length(Segment AB)" to BASE, click OK
Select both the BASE and HEIGHT measures 
Measure, Calculate, Values, BASE*HEIGHT, OK
Select points A, B, D, and C (in that order)
Construct, Polygon Interior
Measure, Area
Observe the measures as you move each of the five points around
Make a text box in which to write your conclusions 

You may elect to print your sketch at this point or wait until you
complete the sketch

Continue on the same sketch
Select the BASE and HEIGHT measures 
Measure, Calculate (BASE * HEIGHT) / 2
Select points A, B, and C
Construct, Polygon Interior                      
Measure Area  
Compare all of the measures you have 
Observe the measures as you move all five points around                                  
Make a text box in which to write your conclusions

Print 

>>>>>>>>>>>>>>>>

GEOMETER'S SKETCHPAD SKETCH THREE in VERSION 4

Before you print a sketch, be sure that your name and conclusions are on 
the sketch.

Edit
Preferences
Text
(Check) Show Labels Automatically For All New Points
OK
Make two points, selecting both (Should be fairly far apart)
Construct
Line
Make point C, not on line AB and not too close to the line
Select point A and point C
Construct
Line
Select line AB and point C
Construct
Parallel Line
Select line AC and point B
Construct
Parallel Line
Select the line parallel to AB through C and the line parallel to AC 
through B
Construct
Intersection, (point D)
NOTE: you might have to adjust your sketch to have it all on the screen
Select point B, then point A, then point C
Measure, Angle BAC
Select C, then D, then B
Measure, Angle CDB
Observe the measures as you move each of the four points
Make a text box in which to type your name and conclusions

You may elect to print your sketch at this point or wait until you 
complete the sketch.  If you print now, use "File," "Print Preview," and 
"Fit to Page."

Continue on the same sketch
Select line AB and point C
Construct
Perpendicular Line
Select the new perpendicular line and line AB
Construct
Intersection (makes point E)
Select all five lines
Display
Hide all five lines
Construct, Segments AB, BD, CD, AC, and CE
Select segment CE
Measure
Length
Using the "A" tool, click on segment CE (when the hand is black)
Move the Hand until an "A" appears in the wrist by Segment CE's name
Change the letter to Height
OK
Select segment AB
Measure
Length
Using the "A" tool, click on segment AB
Move the Hand until an "A" appears in the wrist by Segment AB's name
Change the letter to Base
OK
Select both the BASE and HEIGHT measures 
Measure
Calculate
Values
Base
*   (times)
Height
OK
Select points A, B, D, and C (in that order)
Construct
Quadrilateral Interior
Measure
Area
Observe the measures as you move each of the five points around
Make a text box in which to write your conclusions 

You may elect to print your sketch at this point or wait until you 
complete the sketch.  If you print now, use "File," "Print Preview," and 
"Fit to Page."

Continue on the same sketch
Select the Base and Height measures 
Measure
Calculate
Base 
*   (times)
Height 
/   (divided by)
2
Select points A, B, and C
Construct
Triangle Interior                      
Measure
Area  
Compare all of the measures you have 
Observe the measures as you move all five points around                                  
Make a text box in which to write your conclusions

Print.  Use "File," "Print Preview," and "Fit to Page."