In this lesson our instructor talks about three-dimensional figures. First she discusses polyhedons and solids. Then she talks about prisms, platonic solids, slices and cross sections. Four extra example videos round up this lesson.
Polyhedrons: 3-dimensional solids with all flat surfaces that enclose a single region of space
Polyhedrons have faces, edges, and vertices
Pyramid: A polyhedron that has all faces expect one intersecting at one point
Cylinder: A solid with congruent bases in a pair of parallel planes
Cone: A solid with a circular base and a vertex
Sphere: A set of points in space that are a given distance from a given point
Prism: A polyhedron with two opposite faces parallel and congruent
Platonic Solids: The five types of regular polyhedral
When a plane intersects, or slice, a solid figure, different shapes are formed
If the plane is parallel to the base of the solid, then the intersection of a cross section of the solid
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.