15 7/8 x 15 7/8 in. (40.3 x 40.3 cm) ...
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 ...
33.5 x 33.25 in. (85.1 x 84.5 cm.) ...
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