Illuminations: Scale Factor

Scale Factor
Explore the relationship between two shapes as the scale factor changes.

Instructions
 
The size of Rectangle A can be modified by dragging the red vertices in the upper left and lower right corners of the figure. The Scale Factor can be set to any integer value from 1 to 6. Rectangle B will correspondingly appear from 1 to 6 times as large as Rectangle A.

Exploration
 
How does the ratio between the perimeters change as the scale factor changes?

How does the ratio between the areas change as the scale factor changes?

   Sorry, you must have a java-enabled browser to use this tool.

NCTM Resources

Navigating through Geometry in 6‑8

Lessons
National Council of Teachers of Mathematics Thinkfinity Verizon Foundation
More and Better Mathematics for All Students
© 2000 National Council of Teachers of Mathematics
Use of this Web site constitutes acceptance of the Terms of Use

The National Council of Teachers of Mathematics is a public voice of mathematics education, providing vision, leadership, and professional development to support teachers in ensuring mathematics learning of the highest quality for all students. The views expressed or implied, unless otherwise noted, should not be interpreted as official positions of the Council.