Draw a square first, then find the center points of the four sides, and finally cross.
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On the basis of the first step, directly cut the inscribed regular octagon with a straight line.
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On the basis of the second step, find the diagonal of the initial square and draw it.
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In use, short straight lines are cut into inscribed regular hexagons. With the gradual increase of its sides and angles, it will become more and more like a perfect circle.
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On the basis of the fourth step, the regular hexagon is decorated with an arc to make it a regular circle.
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