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GEOMETRY LESSON Points, lines and planes
Warming Up
Graph inequalities.
1. x ≥ 3
2. 2 ≤ x ≤ 6
-2 0 2 4
0 2 4 6
OBJECTIVES
Identify, name and draw points, lines,
segments, rays and planes.
Apply basic facts about points, lines, and planes.
VOCABULARY
undefined term point
line plane
collinear coplanar
segment endpoint
ray opposite rays
postulate
The most basic figures in geometry are undefined terms, which cannot be defined by
using other figures. The undefined terms point, line, and plane are the building blocks of
geometry.
Points that lie on the same line are collinear. K, L, and M are collinear. K, L, and N are
noncollinear. Points that lie on the same plane are coplanar. Otherwise they are
noncoplanar.
M
K
L
N
Task 1: Naming Points, Lines, and Planes
A. Name four coplanar points.
A, B, C, D
B. Name three lines.
Possible answer: AE, BE, CE
Use the diagram to name two planes.
Possible answer:
Plane R and plane ABC.
Task 2: Drawing Segments and Rays
Draw and label each of the following.
A. a segment with endpoints M and N.
M
N
B. opposite rays with a common endpoint T.
T
Draw a ray with endpoint M that contains N.
M N
A postulate, or axiom, is a statement that is accepted as true without proof. Postulates
about points, lines, and planes help describe geometric properties.
Task 3: Identifying Points and Lines in a Plane
Name a line that passes through two points.
XY
Name a plane that contains three noncollinear points.
Possible answer: plane GHF
Recall that a system of equations is a set of two or more equations containing two or more
of the same variables. The coordinates of the solution of the system satisfy all equations in
the system. These coordinates also locate the point where all the graphs of the equations in
the system intersect.
An intersection is the set of all points that two or more figures have in common. The next
two postulates describe intersections involving lines and planes.
Task 4: Representing Intersections
A. Sketch two lines intersecting in exactly one point.
B. Sketch a figure that shows a line that lies in
a plane.
Use a dashed line to show the hidden parts of any figure that you are drawing. A dashed line
will indicate the part of the figure that is not seen.
Sketch a figure that shows two lines intersect in one point in a plane, but only one of the lines lies
in the plane.
Lesson Quiz
1. Two opposite rays.
CB and CD
2. A point on BC.
Possible answer: D
3. The intersection of plane N and plane T.
Possible answer: BD
4. A plane containing E, D, and B.
Plane T
Draw each of the following.
5. a line intersecting a plane at one point
6. a ray with endpoint P that passes through Q

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Geometry lesson

  • 1. GEOMETRY LESSON Points, lines and planes
  • 2. Warming Up Graph inequalities. 1. x ≥ 3 2. 2 ≤ x ≤ 6 -2 0 2 4 0 2 4 6
  • 3. OBJECTIVES Identify, name and draw points, lines, segments, rays and planes. Apply basic facts about points, lines, and planes.
  • 4. VOCABULARY undefined term point line plane collinear coplanar segment endpoint ray opposite rays postulate
  • 5. The most basic figures in geometry are undefined terms, which cannot be defined by using other figures. The undefined terms point, line, and plane are the building blocks of geometry.
  • 6. Points that lie on the same line are collinear. K, L, and M are collinear. K, L, and N are noncollinear. Points that lie on the same plane are coplanar. Otherwise they are noncoplanar. M K L N
  • 7. Task 1: Naming Points, Lines, and Planes A. Name four coplanar points. A, B, C, D B. Name three lines. Possible answer: AE, BE, CE
  • 8. Use the diagram to name two planes. Possible answer: Plane R and plane ABC.
  • 9.
  • 10. Task 2: Drawing Segments and Rays Draw and label each of the following. A. a segment with endpoints M and N. M N B. opposite rays with a common endpoint T. T
  • 11. Draw a ray with endpoint M that contains N. M N
  • 12. A postulate, or axiom, is a statement that is accepted as true without proof. Postulates about points, lines, and planes help describe geometric properties.
  • 13. Task 3: Identifying Points and Lines in a Plane Name a line that passes through two points. XY
  • 14. Name a plane that contains three noncollinear points. Possible answer: plane GHF
  • 15. Recall that a system of equations is a set of two or more equations containing two or more of the same variables. The coordinates of the solution of the system satisfy all equations in the system. These coordinates also locate the point where all the graphs of the equations in the system intersect. An intersection is the set of all points that two or more figures have in common. The next two postulates describe intersections involving lines and planes.
  • 16. Task 4: Representing Intersections A. Sketch two lines intersecting in exactly one point. B. Sketch a figure that shows a line that lies in a plane.
  • 17. Use a dashed line to show the hidden parts of any figure that you are drawing. A dashed line will indicate the part of the figure that is not seen. Sketch a figure that shows two lines intersect in one point in a plane, but only one of the lines lies in the plane.
  • 18. Lesson Quiz 1. Two opposite rays. CB and CD 2. A point on BC. Possible answer: D 3. The intersection of plane N and plane T. Possible answer: BD 4. A plane containing E, D, and B. Plane T
  • 19. Draw each of the following. 5. a line intersecting a plane at one point 6. a ray with endpoint P that passes through Q