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# Hyuk chan polyhedra

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• ### Hyuk chan polyhedra

1. 1. PolyhedronsPresentation By: Hyuk Chan
2. 2. What is a Polyhedron?Definition from Math on Call:A polyhedron is a 3-dimensional closedfigure with faces that are polygons.
3. 3. What is a Prism?Prisms arepolyhedrons withat least two facesthat are congruentand parallel
4. 4. Prism
5. 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 VolumeAmount of space inside t of a area (Example: Edge tCube’s volume= amount A line where of space inside of the t wo faces of a cube Polyhedron meet
6. 6. Cube Net of a cubeTo get volume thevolume for the cube.You have to addheight, length andwidth.Equation=W x L X H
7. 7. Just IncaseA net is a closed plane figure that can befolded into a closed 3D figure
8. 8. Rectangle prism Net of aTo get the volume for Rectangle prisma rectangle prism. Dothe same thing asyou did for the cube.Equation=Same asa cube
9. 9. CylinderGet the area of one of thecircles of a cylinder Net of aTo get the volume of a circle, Cylinderyou have to multiply theradios by the radios againThen multiply the answeryou got thatThen multiply the height byitEquation=πr h2
10. 10. Cone Net for a ConeThe volume of a coneis 1/3 the volume ofa cylinder with thesame base area andheightEquation= 1/3πr h2
11. 11. SphereSphere is a little hard to explain.It’s connected to a cylinder.The sphere doesn’t fill the whole Net of a Spherecylinder.It only covers 2/3 of the volume of thecylinder which has the same heightand the base area.this is the equation to get volume ofthe 2/3 of a cylinderEquation=4/3πr 3
12. 12. Now a Quiz
13. 13. InstructionsDivide into 3 teamsI’ll give you the questionWrite the answer on a whiteboardput the answer upThe first group to put the answer up andgets it right winsWins=Gets candy
14. 14. Equation of a Cylinder is?
15. 15. Equation of a Cylinder is? Equation=πr h
16. 16. Equation of a Cylinder is? Equation=πr h 2
17. 17. Why is the Equation for a Cone 1/3πr h? 2 Hint πr h is theequation for a cylinder
18. 18. Why is the Equation for a Cone 1/3πr h? 2 Hint πr h is theequation for a cylinder
19. 19. Why is the Equation for a Cone 1/3πr h? 2 Hint πr h is theequation 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
20. 20. Vocabulary QuestionsDon’t worry. Ionly have t wo vocabulary question NET is a...
21. 21. Vocabulary QuestionsDon’t worry. Ionly have t wo vocabulary question NET is a... Closed plan figure that can be a folded in to a closed 3D figure
22. 22. Draw a net of eachFigure I just talked about.
23. 23. What is Polyhedron?
24. 24. What is Polyhedron?A polyhedron is a is a 3-dimensional closed figure with faces that are polygons.