The Lunes of Hippocrates
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The triangle in the semicircle has a right angle at . The sum of the areas of the two lunes (or crescents) is equal to the area of the triangle.
Contributed by: Abraham Gadalla (March 2011)
Open content licensed under CC BY-NC-SA
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"The Lunes of Hippocrates"
http://demonstrations.wolfram.com/TheLunesOfHippocrates/
Wolfram Demonstrations Project
Published: March 7 2011