pons asinorum

[as-uh-nawr-uhm, -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.

1745–55; < Latin pōns asinōrum bridge of asses

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World English Dictionary
pons asinorum (ˌæsɪˈnɔːrəm)
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]

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