Activity Description Measure angles, distances, and areas in several different images (choices include maps, aerial photos, and others). A scale feature allows the user to set the scale used for measuring distances and areas.

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Image Tool

Place in mathematics curriculum:

• Teach students about measurement of angles
• Show how area is measured
• Teach how travel distance is not the same as straight line distance
• Demonstrate ratio and proportion
• Teach students about scale measurements

This activity allows the user to measure angles, distances, and areas in images. A scale feature allows the user to set the scale Image Tool uses for measuring distances and areas. This activity would work well in small groups of 2-3 for about 20-25 minutes if you use the exploration questions and 10-15 minutes otherwise.

Preparations for this activity:

• Explain the concept of ratio and proportion
• Explain how changing the scale effect the length and area mesurements
• Discuss how the scale relates to actual distance on each map
• Show students how to move points and how to start over