It’s no wonder that farmers with fields in the plains surrounding Stonehenge, in southern England, face late-summer mornings with dread. On any given day at the height of the growing season, as many ...

Lamé's formulas for the eigenvalues and eigenfunctions of the Laplacian with Dirichlet boundary conditions on an equilateral triangle are derived using direct elementary mathematical techniques. They ...

The pieces form an equilateral triangle with an inscribed rectangle which transforms into a parallelogram with an inscribed square. This is a special case of Wheeler's model 4K (trapezoid into a ...

A triangle is a polygon. It is a closed 3-sided shape made up of straight lines. The ‘tri-’ part of the word triangle means three. A triangle has 3 sides and 3 angles. Interior angles are the angles ...

Editor’s Note: Published in 1959, this article comes from Martin Gardner’s legendary Scientific American column Mathematical Games. Read more classic Mathematical Games articles in our 2024 special ...