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IMO 2014/P4 - addendum
Author:
Nikolaos Rapanos
ADOE IS #, K is its center and it also lies on DE; therefore KA = KH = KO, hence OH is perpendicular to AH
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גיליון אלקטרוני להעלאת נתוני בעיה ויצירת גרף בהתאם
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