1. GEOMETRY Bridge Tips: Be sure to support your sides when you glue them together. Today: Over Problem Solving 12.1 Instruction Practice

2. 12.1 Exploring Solids Objectives: Know the properties of polyhedrons Classify solids Find Net and Surface Area Vocabulary: on worksheet

3. 12.1 Exploring Solids Objectives: Know the properties of polyhedrons Classify solids Find Net and Surface Area Vocabulary: on worksheet

4. Polyhedron – a three dimensional figure bounded by flat surfaces Face – Each flat surface Edge: Meeting of two faces Vertex: Point where three or more edges meet

5. Prism – Polyhedron with two parallel bases Name: Triangular Prism Base: Two Triangles Faces: Triangle Bases AND Three Rectangles

6. Prism – Polyhedron with two parallel bases Name: Rectangular Prism Base: Two Rectangles Face: Rectangle Bases AND Four Rectangles

7. Prism – Polyhedron with two parallel bases Name: Pentagonal Prism Base: Two Pentagons Faces: Pentagon Bases AND Five Rectangles

8. Prism – Polyhedron with two parallel bases Name: Hexagonal Prism Base: Two Hexagons Faces: Hexagon Bases AND Six Rectangles

9. Pyramid – Polyhedron with one base and all other faces meet at a point Name: Rectangular Pyramid Base: One Rectangle Faces: Rectangular Base and Four Triangles

10. Pyramid – Polyhedron with one base and all other faces meet at a point Name: Pentagonal Pyramid Base: One Pentagon Faces: Pentagonal Base AND Five Triangles

11. Pyramid – Polyhedron with one base and all other faces meet at a point Name: Hexagonal Pyramid Base: One Hexagon Faces: Hexagonal Base AND Six Triangles

12. Platonic Solids: Regular Polyhedrons : All faces regular and congruent Name: Tetrahedron (Triangular Pyramid) Base: One Triangle Faces: Four Equilateral Triangles

13. Platonic Solids: Regular Polyhedrons : All faces regular and congruent Name: Hexahedron (Cube) Base: Two Squares Faces: Six Squares

14. Platonic Solids: Regular Polyhedrons : All faces regular and congruent Name: Octahedron Base: NONE Faces: Eight Equilateral Triangles

15. Platonic Solids: Regular Polyhedrons : All faces regular and congruent Name: Dodecahedron Base: NONE Faces: Twelve Regular Pentagons

16. Platonic Solids: Regular Polyhedrons : All faces regular and congruent Name: Icosahedron Base: NONE Faces: Twenty Equilateral Triangles

17. Solids Not Polyhedrons: Name: Cylinder Base: Two Circles Faces: Two Circles

18. Solids Not Polyhedrons: Name: Cone Base: One Circle Faces: One Circle

19. Solids Not Polyhedrons: Name: Sphere Base: NONE Faces: NONE

20. Net and Surface Area: Net: “Unfolding” of three dimensional shape. Surface Area: Sum of the areas of all the faces. 25 cm 15 cm Draw a net for the pentagonal prism to find the surface area.

21. GEOMETRY Bridge Tips: Be sure to support your sides when you glue them together. Assignment: 12.1 Worksheet