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Intro to Basic Geometry
Kasey Johnson
th
5
Grade Math
How Geometry Shapes
the World
Basic Notation
3 Basic Notation:
1. Point
2. Line
3. Plane
Point
• Point : a position in space
• Labeled with a capital P
P
Plane
•Plane: a flat surface that extends
without end in all directions.
Plane
•Every plane has 3 unique points.
• You would label this plane:
plane ABC
B
A
C
Lines
- A straight path in a
plane
- It extends in both direction
with no end points.
A
B
Short Quiz
What is a Plane?
1. It is a position in space that is label P.
2. It is a flat surface that extends without
end in all directions.
3. It is extends in two directions with no
end points.
Click the frog it see if you know the correct answer.
Lines
Types of Lines:
•Straight Line: Shortest points between two
points.
• Parallel Lines: Lines exactly the same
distance apart.
Lines
Types of Lines Continued:
•Horizontal Lines: Lines parallel to horizon.
Lines
Types of Lines Continued:
• Vertical Lines: Lines at right angle to the
horizon.
Lines
Types of Lines Continued:
• Perpendicular Lines: Two lines that
intersect to form four right angles.
D
A
B
C
Quick Review
What type of lines intersect to form
four right angles?
1. Horizontal Lines
2. Straight Lines
3. Vertical Lines
4. Perpendicular Lines
What is a Shape?
• A form or outline
• A pattern of an objects
circle
oval
Regular
pentagon
octagon
rectangle
Pentagon
•A pentagon is a polygon with 5 sides.
•They have 5 sides and 5 angles.
•There are regular pentagons and
irregular pentagons.
Pentagons
Is the frog behind a regular
pentagon or an irregular pentagon?
Click the correct eye.
Octagons
• An Octagons is a
polygon with 8 sides.
• Polygon: a plane
shape with 3 or more
straight sides
• There are regular
octagons and
irregular octagons
regular
irregular
• A plane shape bounded by a
continuous line which is always the
same distance from the center is a
Circle.
Ovals
Resembling an egg like shape.
Rectangles
• Has four right angles
•Two pair of equal parallel sides
Can these shapes form
planes?
1.Yes
Pentagon
2. No
oval
octagon
circle
rectangle
I think you
have it. Good
Job!
Fun
learning
with
you.
Click me to see
credits
Good bye
Credits
http://www.amathsdictionaryforkids.com/
www.worldvillage.com/kidz/board/hoppers.htm