12.1 Representations of Three-Dimensional FiguresIsometric View – A corner view of three-dimensional geometric solids on two dimensional paper.

Orthographic View – A drawing that shows the top, left, front and right views of a solid.

Cross Section – The intersection of a solid and a plane.

12.2 Surface Areas of Prisms and CylindersLateral Faces – Faces that are not basesLateral Edges – The intersection of the lateral facesAltitude – A perpendicular segment that joins the planes of the bases.Height – The length of the altitude.

Axis – The segment with endpoints that are centers of the circular bases.

12.3 Surface Area of Pyramids and ConesRegular Pyramid – A pyramid that has a base that is a regular polygon and the altitude at the center of the baseSlant Height – The height of each lateral face

Right Cone – A cone where the altitude and axis are the sameOblique Cone – A cone where the altitude and axis are different

12.4 Volumes of Prisms and Cylinders

12.5 Volumes of Pyramids and Cones

12.6 Surface Areas and Volumes of Spheres

Great Circle – A circle that contains the center of the spherePoles – The endpoints of a diameter of a great circleHemisphere – The two congruent halves of a sphere

12.8 Congruent and Similar Solids