1 Prisms and Pyramids.notebook January 22, 2014 Unit 4: Measuring Prisms & Cylinders Remember: Polygon - a two dimensional figure formed by connecting three or more straight line segments end-to-end Polyhedron (pl. polyhedra) - a three dimensional shape whose faces are polygons 3D Objects:
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1 Prisms and Pyramids.notebook January 22, 2014
Unit 4: Measuring Prisms
& Cylinders
Remember:
Polygon - a two dimensional figure formed by connecting three or more straight line segments end-to-end
Polyhedron (pl. polyhedra) - a three dimensional shape whose faces are polygons
3D Objects:
1 Prisms and Pyramids.notebook January 22, 2014
There are many types of three-dimensional shapes/polyhedra. Two special types of polyhedra are prisms and pyramids.
Prisms• a polyhedron • the top and bottom faces are congruent bases • all other faces are rectangles
rectangular prism
pentagonal prism
triangular prism
1 Prisms and Pyramids.notebook January 22, 2014
Pyramid• a polyhedron• the base is a polygon• all other faces are congruent triangles
pentagonal pryamid
rectangular pyramid
triangular pyramid
cube
Other polyhedra:
1 Prisms and Pyramids.notebook January 22, 2014
cone
cylinder
Other 3D Objects:
What would happen if we could take these 3D shapes apart and lay them flat?
Nets:• a net is a diagram that can be folded to make an enclosed 3D object/polyhedron• a net shows all of the faces of an object• the faces are all polygons• two faces meet at an edge• three or more edges meet at a vertex