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Convergence articles

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If 12 cattle eat up 3 1/3 acres of meadow in 4 weeks and 21 cattle eat up 10 acres of exactly similar meadow in 9 weeks, how many cattle shall eat up 36 acres in 18 weeks? (Hint: The grass continues to grow.)

Curve sketching, tangent lines, and optimization, explored via interactive applets

Portraits of 92 living mathematicians, with autobiographical comments.
A description of this well-regarded website.

Having been given the lengths, a and b, of two straight lines drawn from the acute angles of a right triangle to the middle of the opposite sides, determine the lengths of those sides.

Explain the geometric basis of "completing the square," the original method of solving quadratic equations, to your students.
Poster picturing five famous women, from Hypatia to Grace Hopper.
A survey of this theorem's 4000 year history, with applications to many fields.

As is the case with a great deal of interesting mathematics, the conic sections are believed to have been discovered in an attempt to solve a problem, a problem which on the surface seems to have nothing to do with conic sections.

As this biography reveals, Servois fought in battles for Paris and for the foundations of calculus.