6.1 - Solid Shapes

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6.1 - Solid Shapes6.2 - Spatial Relationships
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Were going to talk about 6.1.Please open a
geometry book
373
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The basics

• A Polyhedron is a closed figure, made up of
  polygons.
• Parts of a polyhedron
• Faces these are the polygons
• Edges where the polygons intersect form a
  line
• Vertices corners the point where more than
  two polygons intersect.

• Polygon 2 space
• Polyhedron 3 space
• Polyhedra or Polyhdedrons plural

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Regular Polyhedra (remember regular means all
sides have the same length and all angles have
the same measure)

• A regular Polyhedra is composed of congruent
  regular polygons as faces AND has the same number
  of faces meeting at each vertex.
• Can you think of a regular polyhedron?

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DRAWING PRACTICE!!

• Lets learn how to draw a cube.

1. Draw a square.
2. Draw a congruent square, up and to the right.
3. Connect the vertices

Notice 4 pair of parallel lines
TADA!!
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Platonic Solids

• There are 5 convex, regular polyhedra and they
  are named by the number of faces they have.

NAME FACES MADE OF LOOKS LIKE
Tetrahedron 4 Triangles
Hexahedron 6 Squares
Octahedron 8 Triangles
Dodecahedron 12 pentagons
Icosahedron 20 Triangles
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NETS

• A net is a 2D pattern that, when put together,
  forms a 3D polyhedron.

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Assignment

• Surface area worksheets
• (pg numbers at the bottom are 118-122)