Perpendicular line segment
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the answer is pyramid
You just picture the rectangle in your mind and imagine all of the folds and sides.
The folds in the brain increase the surface area. It nearly triples the surface area. As we grow, more of these bends form.
The last fold will be ineffective in making squares. If you fold a square in half it becomes two rectangles - one on top of the other. This "square" (pardon me, but the site doesn't do accurate 'drawing') shows the folding process. |--------------------------------| |........................................| |........................................| |........................................| |........................................| |........................................| |........................................| |........................................| |........................................| |........................................| |........................................| |--------------------------------| when folded back, becomes |----------------| |....................| |....................| |....................| |....................| |....................| |....................| |....................| |....................| |....................| |....................| |----------------| and when that is folded upwards, it becomes four squares |----------------| |....................| |....................| |....................| |....................| |----------------| The third fold makes eight rectangles.... |--------| |..........| |..........| |..........| |..........| |--------| And the fourth fold makes sixteen squares... |--------| |..........| |..........| |--------| Another fold - a fifth - would bring us back to rectangles again. There would be 32 of them. |----| |.....| |.....| |----|
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