[as-uh-nawr-uh m, -nohr-]
- 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
First recorded in 1745–55, pons asinorum is from the Latin word pōns asinōrum bridge of asses
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the geometric proposition that the angles opposite the two equal sides of an isosceles triangle are equal
Latin: bridge of asses, referring originally to the fifth proposition of the first book of Euclid, which was considered difficult for students to learn