Term – (Informal Definition) – Formal Definition
Formal Definitions from http://www.mathwords.com/index_geometry.htm
Prism – (a three-dimensional solid with rectangular sides and congruent polygon ends) A solid with parallel congruent bases which are both polygons
http://www.mathsisfun.com/geometry/prisms.html
Pyramid – (a polyhedron with a regular polygon base and triangular sides) – A polyhedron with a polygonal base and lateral faces that taper to an apex
http://www.mathsisfun.com/geometry/pyramids.html
Polyhedron – (a three dimensional solid with congruent polygon faces) – A solid with no curved surfaces or edges. All faces are polygons and all edges are line segments
http://en.wikipedia.org/wiki/Polyhedron
Interior Angle – (the inside angle created by two sides of a polygon) – An angle on the interior of a plane figure
http://www.mathsisfun.com/geometry/interior-angles-polygons.html
Polygon – (a closed figure with straight sides) – A closed plane figure for which all sides are line segments
http://en.wikipedia.org/wiki/Polygon
