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Sample Response: Parallel lines never intersect, but
they must be in the same plane. The definition does not
require the undefined term point, but it does require
plane. Because they intersect, perpendicular lines must
be coplanar; consequently, plane is not required in the
definition.
What did you include in your response? Check all that
apply.
Parallel lines do not intersect.
O Parallel lines must be coplanar.
Perpendicular lines intersect at one point.
Perpendicular lines intersect so plane is not
required in the definition.
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Sample Response: Parallel lines never intersect, but
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