1. 6.1 - Solid Shapes & 6.2 - Spatial Relationships

2. We’re going to talk about 6.1. Please open a geometry book
373

3. 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

4. edge
= Vertex
face

5. 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?

6. DRAWING PRACTICE!! Let’s learn how to draw a cube. TADA!!
Draw a square.
Draw a congruent square, up and to the right.
Connect the vertices
Notice 4 pair of parallel lines
TADA!!

7. 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
Dodecahedron 12
pentagons
Icosahedron 20

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

9. Assignment Surface area worksheets
(pg numbers at the bottom are )