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

1 Prisms and Pyramids.notebook January 22, 2014

Nets - Rectangular Prism

Nets - Triangular Prism

1 Prisms and Pyramids.notebook January 22, 2014

Nets - Hexagonal Prism

Nets - Triangular Pyramid

1 Prisms and Pyramids.notebook January 22, 2014

Nets - Rectangular Pyramid

Homework: