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 ...
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.
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