An elementary theorem in geometry whose name means "asses' bridge," perhaps in reference to the fact that fools would be unable to pass this point in their geometric
studies. The theorem states that the angles at the base
of an isosceles triangle (defined as a triangle
with two legs of equal length) are equal and appears as the fifth proposition in
Book I of Euclid's *Elements*.

# Pons Asinorum

## See also

Ass and Mule Problem, ASS Theorem, Isosceles Triangle, Pythagorean Theorem## Explore with Wolfram|Alpha

## References

Dunham, W.*Journey through Genius: The Great Theorems of Mathematics.*New York: Wiley, p. 38, 1990.Wells, D.

*The Penguin Dictionary of Curious and Interesting Geometry.*London: Penguin, pp. 193-194, 1991.

## Referenced on Wolfram|Alpha

Pons Asinorum## Cite this as:

Weisstein, Eric W. "Pons Asinorum." From
*MathWorld*--A Wolfram Web Resource. https://mathworld.wolfram.com/PonsAsinorum.html