Posted by Nicole on .
Show that Euler's formula holds for a right pentagonal prism.

Geometry 
Reiny,
His formula for polyhedra is
Vertices  Edges + Faces = 2
Sketch two congruent pentagons, one above the other.
Join corresponding vertices, perhaps with dotted lines for the lines that are hidden.
You should have a nice drawing of your solid.
Number of vertices = 10
number of edges = 15
number of faces = 7
is 10  15 + 7 = 2 ??
YES!!!! 
Geometry 
Nicole,
Thank you!