1. Polyhedrons
Presentation By: Hyuk Chan

2. What is a Polyhedron?
Definition from Math on Call:
A polyhedron is a 3-dimensional closed
figure with faces that are polygons.

3. What is a Prism?
Prisms are
polyhedrons with
at least two faces
that are congruent
and parallel

4. Prism

5. Vocabulary I will use during
the the Presentation
Face
A flat surface of
Verticals
a polyhedron
The corner points
t
where the line meets
in a Solid Figure t
Volume
Amount of space inside t
of a area (Example: Edge t
Cube’s volume= amount A line where
of space inside of the t wo faces of a
cube Polyhedron meet

6. Cube
Net of a cube
To get volume the
volume for the cube.
You have to add
height, length and
width.
Equation=W x L X H

7. Just Incase
A net is a closed plane figure that can be
folded into a closed 3D figure

8. Rectangle prism
Net of a
To get the volume for Rectangle prism
a rectangle prism. Do
the same thing as
you did for the cube.
Equation=Same as
a cube

9. Cylinder
Get the area of one of the
circles of a cylinder Net of a
To get the volume of a circle,
Cylinder
you have to multiply the
radios by the radios again
Then multiply the answer
you got that
Then multiply the height by
it
Equation=πr h2

10. Cone
Net for a Cone
The volume of a cone
is 1/3 the volume of
a cylinder with the
same base area and
height
Equation= 1/3πr h2

11. Sphere
Sphere is a little hard to explain.
It’s connected to a cylinder.
The sphere doesn’t fill the whole Net of a Sphere
cylinder.
It only covers 2/3 of the volume of the
cylinder which has the same height
and the base area.
this is the equation to get volume of
the 2/3 of a cylinder
Equation=4/3πr 3

13. Now a Quiz

14. Instructions
Divide into 3 teams
I’ll give you the question
Write the answer on a whiteboard
put the answer up
The first group to put the answer up and
gets it right wins
Wins=Gets candy

15. Equation of a Cylinder is?

16. Equation of a Cylinder is?
Equation=πr h

17. Equation of a Cylinder is?
Equation=πr h
2

18. Why is the Equation for
a Cone 1/3πr h?
2
Hint
πr h is the
equation for a
cylinder

19. Why is the Equation for
a Cone 1/3πr h?
2
Hint
πr h is the
equation for a
cylinder

20. Why is the Equation for
a Cone 1/3πr h?
2
Hint
πr h is the
equation for a
cylinder
It is because a volume of a cone is
1/3 of the volume of a cylinder
which has the same base and
height

21. Vocabulary Questions
Don’t worry. I
only have t wo
vocabulary
question NET is a...

22. Vocabulary Questions
Don’t worry. I
only have t wo
vocabulary
question NET is a...
Closed plan figure that
can be a folded in to a
closed 3D figure

23. Draw a net of each
Figure I just talked
about.

24. What is Polyhedron?

25. What is Polyhedron?
A polyhedron is a is a 3-dimensional
closed figure with faces that are
polygons.

26. Sources
http://dictionary.reference.com/browse/
parallel
Math on call, Pg. 393~422
http://math.about.com/od/formulas/ss/
surfaceareavol_2.htm
http://www.algebra.com/algebra/homework/
Volume/Volume-of-a-sphere.solver
http://www.google.com/imghp

27. Thank You
For
Watching
My Presentation