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’t hurt.

The base and perpendicular height are at right angles. Showing that a parallelogram has the same area as a rectangle: Split the parallelogram into a right-angled triangle and a trapezium. Move the ...

Proving that two polygons have the same area can be as easy as cutting them up and rearranging the pieces. Gina the geometry student stayed up too late last night doing her homework while watching The ...

Take any quadrilateral such as ABCD above. Construct the midpoints of each side and join them to form another quadrilateral EFGH. Varignon's Theorem asserts that the ...