3D Shapes

3D Shapes

1. Eulers Rull

   • relationshipes between faces, edges, vertices
   • F+V-E = 2
   • all answers end in 2 no matter what shape

2. Convex and Non - Convex

   • Atleast one side is caved in (non-convex)
   • no sides are caved in (convex)

3. Right and Oblique Solids

   • sides are right angles to the base
   • sides not at a right angle to the base

4. words

   • congruent
   • concave
   • non - convex
   • convex

5. Polyhedron

   • a polyhedron is a solid with plane surfaces

6. Naming solids

   • Prisms
     • base is a polygon
     • all surfaces are flat
     • the cross-section is congruent to, parallel to the base
   • Pyramids
     • the base is a polygon
     • all surfaces are flat
     • all the faces are triangles , other than the base
     • triangles meet at a point called apex
   • Other Solids
     • solids that have curved faces

7. Nets

   • the outline of 3D shapes

8. Views

   • Top, Side and front
     • what you see from the top
     • what you see from the side
     • what you see from the front

9. Platonic Solids

   • platonic solids have regular faces.
   • Shapes
     • cube
     • octahedron
     • dodecahedron
     • icosahedron
     • truncated tetrahedron
     • tetrahedron