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Plane Geometry is about flat shapes like lines, circles and triangles , shapes that can be drawn on a piece of paper

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Why does the area function of a parallelogram have a nonintuitive geometric solution?

It is better to see this property if you stay with parallelograms and use the Cavalieri Principle. Here is page with an animation showing what I mean (clink on the link and accept). There is also a d …
Ricardo Sandoval's user avatar