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1-1 Points, Lines, and Planes
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Real-Life
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Vocabulary
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Undefined Terms- point, line, and plane are considered
undefined terms because they are only explained using
examples and descriptions
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Point- a location – it does not have shape or size (named by
capital letter)
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Line- made up of points and has no thickness or width
(named by a lowercase letter, or two points on the line)
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Plane- a flat surface made up of points that extends infinitely
in all directions (named by a capital script letter, or 3 points
in the plane)
A
P
K
Q
m
J
.
B
.
.
L
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Vocabulary
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Collinear- points that lie on the same line
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Coplanar- points that lie in the same plane
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Intersection- the set of points that two or more geometric
figures have in common
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Space- a boundless, 3-D set of all points
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Examples
Line g ; or line PN
Line j; or line MT
Plane S; or
Plane TNQ
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Practice
Line q
Point B or Point A
Line DC
Plane G or Plane ABD
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Examples
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4. Draw and label a figure for AK and CG intersect at
point M in plane T.
C
T
M
A
K
G
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5. How many planes are shown? 6
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6. Name 3 collinear points: SXM
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7. Are points N, R, S, and W coplanar? Why (not)?
No. NRS all lie on plane A, but W is on plane
WTQP
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Practice
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4. Draw and label a figure for lines q and f intersect at
point Z in plane U.
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5. How many planes are shown? 5
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6. How many of the planes contain points F and E?: 2
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7. Name 4 points that are coplanar:
FEAB, or EDCB, or CAFD