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Pons asinorum
In geometry, the statement that the angles opposite the equal sides of an isosceles triangle are themselves equal is known as the ''pons asinorum'' (/ /; ), Latin for "bridge of donkeys". This statement is Proposition 5 of Book 1 in Euclid's ''Elements'', and is also known as the isosceles triangle theorem. Its converse is also true: if two angles of a triangle are equal, then the sides opposite them are also equal.
The name of this statement is also used metaphorically for a problem or challenge which will separate the sure of mind from the simple, the fleet thinker from the slow, the determined from the dallier; to represent a critical test of ability or understanding.〔(Pons asinorum - Definition and More from the Free Merriam )〕
== Proofs ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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