A circle.
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Crystals.
leaf
1
Points, lines and planes are precisely defined terms. These concepts have to be clearly delineated to form fundamental planks in geometry, and that's because as they do. In suggesting that they are undefined, we'd have to suspect everything that was built on them. No geometric figure could be discussed with any certainty unless the elements that make it up are clearly defined and understood.
√2 x √25 = 1.4142135623731 x 5 = 7.07106781186548