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
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