Your approach to searching will depend to a great extent on what kind of person you are. In an ideal world, when searching for information for a specific purpose, we would all find what exactly we were looking for at the first attempt, especially if we are in a hurry. However, it's always a good idea to have some kind of plan when you are searching for information, if only to help you plan your time and make sure you find the information you need. If I was starting to search for material on h
Author(s): The Open University

The sum of the angles of any triangle is 180Â°. This property can be demonstrated in several ways. One way is to draw a triangle on a piece of paper, mark each angle with a different symbol, and then cut out the angles and arrange them side by side, touching one another as illustrated.

Author(s): The Open University

Look at the shapes below. The symmetry of the shape on the left and its relationship to the shape on the right can be thought of in two ways:

• Fold the left-hand shape along the central line. Then one side lies exactly on top of the other, and gives the shape on the right.

• Imagine a mirror placed along the central dotted line. The reflection in the mirror gives the other half of the shape.

Author(s): The Open University

Structural domains can serve as spacers, which position other domains in an appropriate orientation or location, or they may permit movement of domains relative to each other. Examples of domains that function as spacers are the heavy and light immunoglobulin constant domains which â€˜presentâ€™ the working end of the immunoglobulin, i.e. the variable domains, for binding to target antigen (Author(s): The Open University