CK-12 Foundation
Ck 12: Elem Math: Overview of Flat Surfaces of 3 D Shapes
[Free Registration/Login may be required to access all resource tools.] The video shows various 3D shapes and describes the flat surfaces that comprise the 3D shape and those 3D objects that don't contain flat surfaces.
Khan Academy
Khan Academy: Intro to Area and Unit Squares
Models how to find the area of shapes that have only right angles by covering them with square units. [4:17]
Loyola University Chicago
Math Flix: Polyhedra Basics Using Nets
This QuickTime movie provides an opportunity to learn about the basics of Polyhedra using Nets. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.
Khan Academy
Khan Academy: Counting Faces and Edges of 3 D Shapes
Sal identifies the faces and edges on various 3D shapes. [3:36]
Khan Academy
Khan Academy: Recognizing Common 3 D Shapes
Sal identifies the following 3D shapes: square pyramid, rectangular prism, triangular prism, cylinder, and cone. [3:28]
Khan Academy
Khan Academy: Measuring Area With Partial Unit Squares
Models how to find the area of a shape on a grid that has different angle sizes by counting both square and partial units. [3:16]
Khan Academy
Khan Academy: Decomposing Shapes to Find Area: Add
Demonstrates how to break an irregular shape into three rectangles, find the individual areas, and then add them together. [3:36]