GEOMETRY

Bridge Tips:

Be sure to support your sides when you glue them together.

Today: Over Problem Solving 12.1 Instruction Practice

12.1 Exploring Solids

Objectives: Know the properties of

polyhedrons Classify solids Find Net and Surface Area

Vocabulary: on worksheet

12.1 Exploring Solids

Objectives: Know the properties of

polyhedrons Classify solids Find Net and Surface Area

Vocabulary: on worksheet

Polyhedron – a three dimensional figure bounded by flat surfacesFace – Each flat surface

Edge: Meeting of two faces

Vertex: Point where three or more edges meet

Prism – Polyhedron with two parallel bases

Name: Triangular Prism

Base: Two Triangles

Faces: Triangle Bases AND Three Rectangles

Prism – Polyhedron with two parallel bases

Name: Rectangular Prism

Base: Two Rectangles

Face: Rectangle Bases AND Four Rectangles

Prism – Polyhedron with two parallel bases

Name: Pentagonal Prism

Base: Two Pentagons

Faces: Pentagon Bases AND Five Rectangles

Prism – Polyhedron with two parallel bases

Name: Hexagonal Prism

Base: Two Hexagons

Faces: Hexagon Bases AND Six Rectangles

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

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

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

Platonic Solids: Regular Polyhedrons

: All faces regular and congruent

Name: Tetrahedron (Triangular Pyramid)

Base: One Triangle

Faces: Four Equilateral Triangles

Platonic Solids: Regular Polyhedrons

: All faces regular and congruent

Name: Hexahedron (Cube)Base: Two Squares

Faces: Six Squares

Platonic Solids: Regular Polyhedrons

: All faces regular and congruent

Name: OctahedronBase: NONE

Faces: Eight Equilateral Triangles

Platonic Solids: Regular Polyhedrons

: All faces regular and congruent

Name: DodecahedronBase: NONE

Faces: Twelve Regular Pentagons

Platonic Solids: Regular Polyhedrons

: All faces regular and congruent

Name: IcosahedronBase: NONE

Faces: Twenty Equilateral Triangles

Solids Not Polyhedrons:

Name: Cylinder

Base: Two Circles

Faces: Two Circles

Solids Not Polyhedrons:

Name: Cone

Base: One Circle

Faces: One Circle

Solids Not Polyhedrons:

Name: Sphere

Base: NONE

Faces: NONE

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.

GEOMETRY

Bridge Tips:

Be sure to support your sides when you glue them together.

Assignment: 12.1 Worksheet