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Ch. 3.1 Skew, parallel, perpendicular
(never touch)
Parallel

Intersecting
(will touch)
OR
Lines on the same plane (same flat surface)
are either:
Lines that intersect forming 90 degree angles
are perpendicular lines.
Intersecting
?
Perpendicular
?
Parallel
?
skew lines
Skew lines lie on separate planes
they are not parallel, they do not intersect
The orange lines
are skew lines
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
The orange lines
are:
Parallel (same plane, never touch)
 Perpendicular (intersect at 90  angles)
Skew (different planes, never touch)
∘
∘
The
End
参加了这次测试的学生也参加了 :
Geometry ~angle pairs
Geo a- lesson - parallel lines and angles
Congruency in isosceles and equilateral triangles
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