St. James Nets

• ​A polyhedron is a closed three-dimensional figure made up of flat polygonal regions.

• A face of a polyhedron is a flat surface on the polyhedron​

• ​An edge of a polyhedron is a line segment where the faces of the polyhedron intersect.

• ​The vertex of a polyhedron is the intersection of three edges of the polyhedron.

• ​The bases of a prism or cylinder are the two parallel congruent faces of the solid.

• ​The base of a pyramid or cone is the face of the solid opposite the vertex of the solid.

A polyhedron is a 3D figure that is formed by polygons.

Examples of polyhedrons include a cube, prism, or pyramid. Non-polyhedrons are cones, spheres, and cylinders because they have sides that are not polygons.

Prisms are 3 dimensional figures that have polygons for bases that are parallel and congruent

​Prisms

A pyramid is a geometric figure that has a polygon base with sides that come to a point 1 base

• Triangular faces

• Names come from the bases

• Example: The square pyramid has one square base

​Pyramid

A prism is a polyhedron with two congruent bases and the lateral sides are rectangles.

A pyramid is a polyhedron with one base and all the lateral sides meet at a common vertex.

Note: All prisms and pyramids are named by their bases.

A net is an unfolded, flat representation of the sides of a 3D shape.

Note: There are several different nets of any polyhedron.

• Nets are the unfolded version of a 3d figure.

• A net shows you all the different faces and base(s)

• We can use nets to help us calculate surface area