Department of Mathematics Education
Dr. J. Wilson, EMAT 6690

Constructing A Circular Window
by David Wise


Use a compass and ruler to construct the following design of a circular window. How can it be constructed?


The key to this construction is to realize that the window design is produced from three smaller congruent circles that are all externally tangent to each other and internally tangent to the large circular window.






Click here to investigate the GSP sketch for yourself.

If you have any suggestions that would be useful, especially for use at the high school level, please send e-mail to

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