Name________________________________________________________Date____________________Period________
DO NOW!: Intro to Lines
Fill in the blank with always, sometimes, or never.
1. If two planes intersect, then they intersect at a line.
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2. If two lines intersect, then they intersect at two different points.
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4. Two lines intersect at one point.
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3.
is another name for
.
5. One line can be drawn through three points.
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6. In your own words, what does intersect mean?
______________________________________________________________________________
Use the figure to answer # 7-9:
7. Will
space.)
8.
and
ever intersect in space? (Lines that intersect on the page do not necessarily intersect in
Will the following pairs of lines intersect in space?
a.
and
b.
and
c.
and
d.
and
9. Are the following pairs of lines coplanar?
This means: _______________________________________________________________________________?
a.
and
b.
and
c.
and
d.
and
Name________________________________________________________Date____________________Period________
We will learn to: ____________________________________________________________________________________
2 Lines
Type of Lines
Oblique Lines
Perpendicular Lines
Parallel Lines
Skew Lines
Characteristics
Picture
Example 1: Think of each face of the figure as a plane.
a) List all lines parallel to
.
b) List all lines parallel to
containing point A.
c) List all lines skew to
.
d) List all lines skew to
containing point A.
e) List all lines perpendicular to
.
f)
containing point A.
List all lines perpendicular to
g) Extension: Name the plane that is parallel to Plane EFG.
Example 2: Think of each segment in the figure as part of a line.
a) List all lines parallel to
.
b) List all lines parallel to
containing point F.
c) List all lines skew to
.
d) List all lines skew to
containing point F.
e) List all lines perpendicular to
.
f)
containing point F.
List all lines perpendicular to
g) Extension: Name the plane that is parallel to Plane BAH.
Example 3: Think of each segment in the figure as part of a line.
a) List all lines parallel to
b) List all lines skew to
.
.
c) Describe
and
.