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pons asinorum

[as-uh-nawr-uh m, -nohr-] /ˌæs əˈnɔr əm, -ˈnoʊr-/
a geometric proposition that if a triangle has two of its sides equal, the angles opposite these sides are also equal: so named from the difficulty experienced by beginners in mastering it. Euclid, 1:5.
Origin of pons asinorum
1745-55; < Latin pōns asinōrum bridge of asses Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for pons-asinorum

pons asinorum

the geometric proposition that the angles opposite the two equal sides of an isosceles triangle are equal
Word Origin
Latin: bridge of asses, referring originally to the fifth proposition of the first book of Euclid, which was considered difficult for students to learn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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