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Introduction 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.

Many interactive games for students to play. These games cover many areas in math

In a combined operation, the navy and airforce have a helicopter and submarine at the levels shown: Helicopter: 230 m above sea level Submarine: 80 m below the surface of the ocean, directly under the helicopter A parachutist from the helicopter has 76 m to fall before hitting the ocean. a How far is the parachutist from the submarine? b What distance from the helicopter is she? c How far apart are the helicopter and submarine?