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 Interactive Checkpoint
 Skew Lines:  Two lines that do not lie in the same plane (therefore, they cannot be parallel or intersect).

Which of the following describes a pair of skew lines? Choose the answer from the menu Graded Response
a) two pencils on a table
b) a paperclip    
c) the letter X on a treasure map    
d) elevated roads that cross one-another, but do not have a traffic intersection because there is an overpass