WHO created this geometry theory?

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The discussion centers on a geometry theory involving a semicircle and its relationship to a rectangle and a cone. The theory claims that the area of the semicircle EBIG equals the difference between the rectangle ACJD and the cutoff cone ACHF. However, skepticism is expressed regarding the validity of this theory, particularly in terms of area comparisons between the semicircle and a triangle. The visual representation raises doubts about the accuracy of the claims, suggesting that the semicircle has a larger area than the triangle. Overall, the theory's origins and validity remain unclear, prompting a request for more information.
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http://www.freakinbananas.com/maths.jpg

ok the theory says something like...

the semicircle EBIG = the difference between the rectangle ACJD and the cutoff cone ACHF

not sure if this is some important thing or anything?

but if it is,

who made it and where can i get some info bout it?
 
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But it looks false to me...Basically you're stating that half of the small semicircle cutoff equals one of the side triangles...but the height is equal...almoust, the base of half is a lot bigger, and a semicircle attracts more surface than a triangle...in the curve vs oblique line.

I see it as not true to be honest...but that's only by looknig at the picture.
 
ok thanks that is all. no more comment needed
 
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