geometry
DESCRIPTION
An interactive presentation about basic geometry concepts like lines, line segments, points, and rays.TRANSCRIPT
By Kelly Boushell
Submitted June 5th, 2010
Dr. Sims
ITC 525 Computers for Educators
A REVIEW OF BASIC CONCEPTS
BEGIN
Table of Contents
“Choose one of the topics above to begin.”
“When you are ready to begin another topic click on me at the bottom of the screen to
come back to the table of contents.”
Points
Line Segments
Lines
Rays Angles
CitationsStandards
POINTPOINT
A point is a location in space.
Capital letters are used to name points.
AKG
M
More info here!
Table of Contents
Watch movie!
LINE SEGMENTLINE SEGMENT
A line segment is made up of 2 points and the straight path between them.
ND
The two points at the ends of a line segment are called endpoints.
This line segment is called:
ND or DN
Table of Contents
More info here!
Quiz Me!
Quiz Me!
1. What is the name of this geometric figure?
B. Line Segment
A. Line
C. Ray
ME
Table of Contents
BACK
Try Again
What is the name of this geometric figure?
B. Line Segment
A. Line
C. Ray
ME
Table of Contents
Need a little help?BACK
Fabulous!
What is the name of this geometric figure?
B. Line Segment
MEYou remembered a line
segment is made up of 2 points and the straight path between them!
Table of Contents
LINELINE
A line is a straight path that goes on forever in both directions.
JR
The arrowheads symbolize the line continuing forever, even though it looks like it stops at the arrowheads.
This line is called:
RJ or JR
R and J are points, not end
points!
Table of Contents
More info here!
Quiz Me!
Quiz Me!
What is the name of this geometric figure?
A. Line
B. Line Segment
C. Ray
Table of Contents
H
ZBACK
Try Again
What is the name of this geometric figure?
A. Line
B. Line Segment
C. Ray
Table of Contents
H
ZNeed a little help?
BACK
Superb!
What is the name of this geometric figure?
A. Line
Table of Contents
H
ZYou remembered a line is a straight path that goes
on forever in both directions!
RAYRAYA ray is a straight path that has a starting point and goes on forever in one direction.
B
WThis is point B
This is endpoint W
This ray is called:
WB
Note the difference between point and endpoint!
The endpoint is always the first letter in the name of a ray!
Table of Contents
More info here!
Quiz Me!
Quiz Me!
3. What is the name of this ray?
D
OA. OD
C. DO
B. OD
Table of Contents
BACK
Try Again
3. What is the name of this ray?
D
OA. OD
C. DO
B. OD
Table of Contents
Need a little help?BACK
Fantastic!
3. What is the name of this ray?
D
OA. OD
You remembered that the endpoint is always the first letter in the name of a
ray!
Table of Contents
ANGLEANGLE
NEXT
An angle is formed by 2 rays or 2 line segments that share the same endpoint.
The endpoint where the rays or segments meet is called the
vertex of the angle.
The rays or segments are called the sides of
the angle.
Table of Contents
More info here!
Naming AnglesNaming Angles
NEXT
The vertex of the angle must always be in the middle of the, between the points
on the sides.A
BC This angle is called:
ABC
The vertex point is B. That is why B is in the middle of the
sides A and C.
CBA
or
Table of Contents
BACK
Classifying AnglesClassifying Angles
Table of Contents
More info here!
Quiz Me!
Watch movie!
Straight Angle
Measures exactly 180
Acute Angle
Measures between 0 and 90
Reflex Angle
Measures between 180 and 360
Obtuse Angle
Measures between 90 and 180
Right Angle
Measures exactly 90
BACK
Quiz Me!
Table of Contents
4. What is the classification of this angle?
A. Acute Angle
B. Reflex Angle
C. Obtuse Angle
BACK
Try Again
Table of Contents
4. What is the classification of this angle?
A. Acute Angle
B. Reflex Angle
C. Obtuse AngleNeed a little help?
BACK
Awesome!
Table of Contents
4. What is the classification of this angle?
C. Obtuse AngleYou remembered that
an obtuse angle measures between 90
and 180 !
CitationsBell, M. (2002). Everyday mathematics student reference book. Chicago: McGraw-Hill.
Bell, M. (2002). Everyday mathematics teacher lesson guide. Chicago: McGraw-Hill.
Eather, J. (2001). A maths dictionary for kids. Retrieved on June 3, 2010 from http://www.amathsdictionaryforkids.com/
Pennsylvania department of education. (2009). Academic standards for mathematics. Retrieved on June 3, 2010 from http://www.pdesas.org/main/fileview/Academic_Standards_for_Mathematics_(Elementary).pdf
Weatherall, P. (2009). Angles music video [YouTube Video]. Retrieved on June 3, 2010 from http://www.youtube.com/watch?v=yptZt9hwrzU&feature=related
YourTutorOnline. (2009). Points and lines [YouTube Video]. Retrieved on June 3, 2010 from http://www.youtube.com/watch?v=AJEjpy7AmBU
Zahn, C. (n.d.) You are here' sign/ man getting squashed by an 'x‘. Retrieved on June 3, 2010 from http://www.cartoonstock.com/lowres/cza0219l.jpg
Table of Contents