Copy of Parallel & Perpendicular Consequence

The following applet demonstrates a property that parallel lines have when they're drawn in the coordinate plane. Be sure to move the blue points around quite a bit!
This applet demonstrates a property that perpendicular lines have when they're drawn in the coordinate plane. Be sure to move the points around quite a bit and observe carefully as you do!
What can you conclude about parallel lines drawn in the coordinate plane?
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What can you conclude about perpendicular lines that are drawn in the coordinate plane? (Assume the lines are not aligned horizontally and vertically).
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Bold [ctrl+b]
Italic [ctrl+i]
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Superscript
Subscript
Font color
Auto
Justify
Align left
Align right
Align center
• Unordered list
1. Ordered list
Link [ctrl+shift+2]
Quote [ctrl+shift+3]
[code]Code [ctrl+shift+4]
Insert table
Remove Format
Insert image [ctrl+shift+1]
Insert icons of GeoGebra tools
[bbcode]
Text tools
Insert Math
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– Lewis Prisco, Tim Brzezinski

Information: Copy of Parallel & Perpendicular Consequence