Powerpoint on THE UNDEFINED TERMS IN GEOMETRY(POINTS,LINES & PLANES)

2. VIDEO: https://www.youtube.com/watch?v=anRWuIq06RM

3. QUESTIONS:
1. What have you learned from the video?
2. What are the 3 important terms mentioned?
What do they call these 3 terms?
4. Can you guess what our lesson is?
3. Why do they call these terms as
“undefined terms” ?

4. POINTS, LINES
and PLANES

5. Activity 1
Title: Objects Representing
the Undefined Terms

6. There are some objects around us that could represent a
point or line or plane. They are written below. Place each
object in its corresponding column in the table.
Activity 1
Blackboard Corner of a table tip of a needle
intersection of a side wall
and ceiling
Light made by laser
Electric wire
Intersection of the front wall,
a side wall and ceiling
Tip of a ballpen
surface of a table
Edge of a tableWall
Paper

7. Objects that could
represent a POINT
Objects that could
represent a LINE
Objects that could
represent a PLANE
Corner of a table intersection of a side wall
and ceiling
Blackboard
tip of a needle Electric wire surface of a table
Light made by laser Edge of a table Wall
Intersection of the front
wall, a side wall and
ceiling
Paper
Tip of a ballpen
Answers to Activity 1

8. POINT
A point suggests an exact location in
space. It has no dimension.
We use a capital letter to name
a point.
AEx: Point A

9. LINE
A line is a set of points arranged in a row. It is
extended endlessly in both directions.
Two points determine a line. That is, two distinct points
are contained by exactly one line.
We use a lower case letter or any two points on the
line to name the line.
m
R
V
line m or 𝑅𝑉

10. PLANE
A plane is a set of points in an endless flat surface.
 The following determine a plane:
(d) a line and a point not on the line. We use a small letter
or three points on the plane to name the plane.
(a) three non-collinear points;
(b) two intersecting lines;
(c) two parallel lines; or
A
B C
plane ABC

11. List down 3 other objects that could represent
a. a point.
b. a line.
c. a plane.
ACTIVITY 2

12.  How do you represent a point?
Can you show it to the class?
 How about a line?
Can you see something inside the
classroom that would represent a line?
 Name concrete model that will
represent a plane?

14. 1. Which of the following undefined terms is represented by
the surface of this bamboo bed (or lantay) ?
a. point
b. line
c. plane
d. space Papag/Lantay (Bamboo Bed), DCCM V.D.3

15. 2. A line can be represented by which of
the following?
a. flagpole
b. Dot on the letter i
c. blackboard
d. surface of a tray

16. 3. The tip of the native Filipino hat
(or sarok)below represents _____?
a. a line
b. a plane
c. a point
d. a space
Sarok/Salakot (Native Filipino Hat), DCCM V.A.18

17. 4. The upper surface of this wooden
trunk (or kaban) is a representation
of which undefined term?
a. point
b. plane
c. line
d. space
Kaban / Ba-ol (Wooden Trunk), DCCM V.D.2

18. 5. It is a word or term which does not
require a further explanation.
a. rational
b. irrational
c. defined term
d. undefined term

19. THANK YOU
FOR
LISTENING!
Created by: JOEGEN A. LIMAS, Secondary School Teacher