# The Eyeball Theorem

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Draw tangents from the centers U and V of the circles to the other circle. Then the lengths of AB and CD are equal.

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Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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## Details

detailSectionParagraph## Permanent Citation

"The Eyeball Theorem"

http://demonstrations.wolfram.com/TheEyeballTheorem/

Wolfram Demonstrations Project

Published: March 7 2011