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laodao (老道)
1.  已知AB等于边长.分别以A,B为圆心,AB为半径画弧交于O,以O为圆心,AB为半径
画圆.再按上法可作出所求正六边形. [已知外接圆作正七边形(近似作法)] ...
2. 几何的三大问题. 平面几何作图限制只能用直尺、圆规,而这里所谓的直尺
是指没有刻度只能画直线的尺。用直尺与圆规当然可以做出许多种之图形,
但有些图形如正七边形、正九边形就做不出来。有些问题看起来好像很简单 ...
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(#284128@0)
2001-12-3 -04:00
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