Group items tagged

"over 5,000 maps representing many different time periods. A friendly license allows teachers and students to use up to 25 maps in non-commercial school projects without further permission. All maps are available as GIF or JPEG files"

This activity allows the user to measure angles and explore the concept of "scale" as it pertains to maps, images, and drawings. The scale feature allows the user to define a scale and then using that scale, measure distances or areas on a selected image. Understanding scale measurements requires understanding the concept of proportion. When using a scale model or drawing, a ratio is given such that a measurement taken from the model or drawing represents another measurement, presumably the "life size" measurement the model or drawing represents. This ratio can then be set equal to a second ratio where a second measurement is taken from the model or drawing in order to determine the unknown "life size" measurement.