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The Eyeball Theorem
Draw tangents from the centers U and V of the circles to the other circle. Then the lengths of AB and CD are equal.
You can drag the orange centers or use the sliders to change the figure.
Contributed by:
Jay Warendorff
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Eyeball Theorem
(
Wolfram
MathWorld
)
PERMANENT CITATION
"
The Eyeball Theorem
" from
the Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TheEyeballTheorem/
Contributed by:
Jay Warendorff
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