The history of the Parallelogram Rule for composing physical quantities, such as motions and forces, is marked by conceptual difficulties leading to false starts and halting progress. In particular, ...

A refresher course in high school geometry isn’t a prerequisite for “A Parallelogram,” the play by Pulitzer Prize-winner Bruce Norris running at the Mark Taper Forum. But it certainly wouldn ...

How to prove the area of a parallelogram is base × height slideshow Click to see a step-by-step slideshow. WHAT YOU NEED: ruler, scissors, pencil, piece of card.

Greek letters! Blecch. So sure, respect the parallelogram, but only because such a simple looking thing requires more math than you’d think to figure it out. No worries, though.

Bruce Norris' "A Parallelogram," at the Mark Taper Forum, is an existential riddle that's ultimately more vexing than enlightening. Charles McNulty reviews.