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Geometry Dots &
Lines
Made by Listening Daisy, based on notes from her Geometry
Class (with permission from her instructor).
Table of Contents
? ºÝºÝߣ 3: What is a Point?
? ºÝºÝߣ 4: Mini Lesson: What Letters Not To Use When Naming Points
? ºÝºÝߣ 5: What Is A Line?
? ºÝºÝߣ 6: How To Name A Line
? ºÝºÝߣ 7: What Is A Line Segment?
? ºÝºÝߣ 8: What Is A Ray?
? ºÝºÝߣ 9: Name That Ray!
? ºÝºÝߣ 11: Mini Lesson: Additional Way to Name A Line
? ºÝºÝߣ 12: What Is Collinear?
? ºÝºÝߣ 13: What Is A Plane?
? ºÝºÝߣ 14: What Is Intersection?
? ºÝºÝߣ 16: Mini Lesson: Lines & Intersection
? ºÝºÝߣ 17: What Is Space?
What is a Point?
? Points have no dimension they are ¡°a place in space¡±.
? When you name a point, use capital letters (usually
the Roman Alphabet is used, but sometimes Greek
letters are used).
A
Mini Lesson: What Letters Not
To Use When Naming Points
When naming points, try not to use letters like T and S due
to the fact they could be easily confused with something
else.
For example, S and 5 look very similar.
What Is A Line?
B
A
AB
Symbol for the line:
? It has no end points
? It has an infinite number of points
? It is straight and not curved
? Lines go off towards infinity in two directions
How To Name A Line
? Now I¡¯m sure you saw the symbol on the top right corner of
the slide before this. is the abbreviation for a line, it is the
name of the line. To make this symbol there must be at least
two points on a line. Let¡¯s use the line below as an example.
? Since it has over two points, we can name it. You can only use
two letters in the name however.
? It is preferred that the letters of the name are read left to right
as in the names AB, BC, & AC. It is also possible to use names
like BA, CB & CA though.
AB
B
A C
What Is A Line Segment?
? Straight
? Made up of points
? To name it, you use the end points, not the points on the
line.
A B
AB
Symbol for the line:
What Is A Ray?
? Ray: half a line, on one end it has a finite end point and on the
other end it goes off infinitely
? Straight
? Needs two points to name: when naming, always start with
the end point. It can¡¯t be BA because BA is:
A B
AB
Symbol for the line:
B
A
Name That Ray!
Where are the rays?
A B C
Name That Ray!
A B C
The rays that are located here are BA, BC & AC
A B
B C
A C
Mini Lesson: Additional Way to
Name A Line
? An additional way to name a line is to use a lower case
cursive letter.
What is Collinear?
? When there are more then three points on the same line.
? Ex 1: A, B & C are collinear
? Ex 2: A, B & C are not collinear
A B C
A B C
What Is A Plane?
? Flat
? 2-dimensional
? Named using its four points or a single cursive letter.
or
A B
C D
Note: The cursive letters must always be capitalized
What Is Intersection?
? When lines cross, it¡¯s in the form of a point
? When planes cross it¡¯s a line segment
? When a line crosses a plane it¡¯s a point.
What Is Intersection?
? When three planes intersect, it¡¯s a point.
Mini Lesson: Lines &
Intersection
? A line can only intersect at one point.
? For example, due to the fact that the line is straight, it cannot
curve to create another point inside the shape.
What Is Space?
? A set of all possible points
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Geometry dots & lines

  • 1. Geometry Dots & Lines Made by Listening Daisy, based on notes from her Geometry Class (with permission from her instructor).
  • 2. Table of Contents ? ºÝºÝߣ 3: What is a Point? ? ºÝºÝߣ 4: Mini Lesson: What Letters Not To Use When Naming Points ? ºÝºÝߣ 5: What Is A Line? ? ºÝºÝߣ 6: How To Name A Line ? ºÝºÝߣ 7: What Is A Line Segment? ? ºÝºÝߣ 8: What Is A Ray? ? ºÝºÝߣ 9: Name That Ray! ? ºÝºÝߣ 11: Mini Lesson: Additional Way to Name A Line ? ºÝºÝߣ 12: What Is Collinear? ? ºÝºÝߣ 13: What Is A Plane? ? ºÝºÝߣ 14: What Is Intersection? ? ºÝºÝߣ 16: Mini Lesson: Lines & Intersection ? ºÝºÝߣ 17: What Is Space?
  • 3. What is a Point? ? Points have no dimension they are ¡°a place in space¡±. ? When you name a point, use capital letters (usually the Roman Alphabet is used, but sometimes Greek letters are used). A
  • 4. Mini Lesson: What Letters Not To Use When Naming Points When naming points, try not to use letters like T and S due to the fact they could be easily confused with something else. For example, S and 5 look very similar.
  • 5. What Is A Line? B A AB Symbol for the line: ? It has no end points ? It has an infinite number of points ? It is straight and not curved ? Lines go off towards infinity in two directions
  • 6. How To Name A Line ? Now I¡¯m sure you saw the symbol on the top right corner of the slide before this. is the abbreviation for a line, it is the name of the line. To make this symbol there must be at least two points on a line. Let¡¯s use the line below as an example. ? Since it has over two points, we can name it. You can only use two letters in the name however. ? It is preferred that the letters of the name are read left to right as in the names AB, BC, & AC. It is also possible to use names like BA, CB & CA though. AB B A C
  • 7. What Is A Line Segment? ? Straight ? Made up of points ? To name it, you use the end points, not the points on the line. A B AB Symbol for the line:
  • 8. What Is A Ray? ? Ray: half a line, on one end it has a finite end point and on the other end it goes off infinitely ? Straight ? Needs two points to name: when naming, always start with the end point. It can¡¯t be BA because BA is: A B AB Symbol for the line: B A
  • 9. Name That Ray! Where are the rays? A B C
  • 10. Name That Ray! A B C The rays that are located here are BA, BC & AC A B B C A C
  • 11. Mini Lesson: Additional Way to Name A Line ? An additional way to name a line is to use a lower case cursive letter.
  • 12. What is Collinear? ? When there are more then three points on the same line. ? Ex 1: A, B & C are collinear ? Ex 2: A, B & C are not collinear A B C A B C
  • 13. What Is A Plane? ? Flat ? 2-dimensional ? Named using its four points or a single cursive letter. or A B C D Note: The cursive letters must always be capitalized
  • 14. What Is Intersection? ? When lines cross, it¡¯s in the form of a point ? When planes cross it¡¯s a line segment ? When a line crosses a plane it¡¯s a point.
  • 15. What Is Intersection? ? When three planes intersect, it¡¯s a point.
  • 16. Mini Lesson: Lines & Intersection ? A line can only intersect at one point. ? For example, due to the fact that the line is straight, it cannot curve to create another point inside the shape.
  • 17. What Is Space? ? A set of all possible points