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.

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 ...

A new initiative pieced together by the National Quilt Museum, along with professors at Murray State University, is using the fiber arts to teach K-12 students about geometry and other mathematical ...