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Bullseye Illusion

BullseyeIllusion

Although the inner shaded region has the same area as the outer shaded annulus, it appears to be larger. Since the rings are equally spaced,

A_(inner)=pi·3^2=9pi
(1)
A_(outer)=pi·5^2-pi·4^2=9pi.
(2)

See also

Illusion

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References

Wells, D. The Penguin Dictionary of Curious and Interesting Geometry. London: Penguin, p. 87, 1991.

Referenced on Wolfram|Alpha

Bullseye Illusion

Cite this as:

Weisstein, Eric W. "Bullseye Illusion." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/BullseyeIllusion.html

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