Introduction to 3D Shapes

                    We live in a three-dimensional world. Every object you can see or touch has three dimensions that can be measured: length, width, and height. The room you are sitting in can be described by these three dimensions. The monitor you're looking at has these three dimensions. Even you can be described by these three dimensions. In fact, the clothes you are wearing were made specifically for a person with your dimensions.

                   In the world around us, there are many three-dimensional geometric shapes. In these lessons, you'll learn about some of them. You'll learn some of the terminology used to describe them, how to calculate their surface area and volume, as well as a lot about their mathematical properties.

• Faces refers to the sides of a shape.  
• A vertex is where two or more points meet; a corner. 
• The edge of a shape is the line where two surfaces meet.

REMEMBER:

 In a three-dimensional shape, you may not always be able to see all of the faces (sides)
 of the shape.