八边形，顾名思义，就是有八条边的图形，而正八边形是八条边都相等的八边形。那么，怎样才能得到一个正八边形呢？看过本文之后，你就知道了。
步骤
方法 1 的 3:
纸和直尺
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1
要用纸做出一个八边形，你需要准备一张正方形的纸。
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2
将正方形的四个角向里折，这样你就得到了一个八边形。利用尺子，将各边边长调整成一样的长度。
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3
将折叠的四个角剪下了。
方法 2 的 3:
量角器和直尺
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1
决定八边形的边长。
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2
在纸上画出一条线段，长度为上一步确定的边长。这就是八边形的一条边。
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3
使用量角器和直尺，画出一条长度相同，但是和第一条线段的夹角为135度的线段。这是八边形的另一条边。
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4
再用相同的方法，画出一条和第二条线段呈135度角的线段。不断重复这个过程，直到画出整个正八边形的八条边为止。
方法 3 的 3:
圆规和直尺
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1
使用圆规画出一个圆，圆的直径是正八边形的最长对角线。
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2
再用圆规画一个更大的圆。比如，如果第一步的圆的半径为2厘米，那么大圆的半径就可以是2.5厘米。从这一步开始，就不要再改变圆规的长度了。
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3
将圆规的针头扎到直径和内圆交点，然后画出一道弧线，这道弧线要和内圆相交。
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4
再直径和内圆的另一个交点处，重复上述过程。这样，在圆中央就有了一个“眼睛”。
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5
用直尺画两道经过“眼角”的直线。两条线一定要足够长，能够贯穿两个圆，同时，这两条线还要和直径平行。
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6
在“眼角处”重复第三步。这样你就有了两个相互重叠的“眼睛”了，它俩一共有四个交点。
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7
用直尺画出两条经过另一只“眼”的“眼角处”的直线，类似于第五步。
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8
这样就得到了八个直线和圆的交点。这八个点就是正八边形的八个角，将它们连起来就得到了一个正八边形。
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9
擦掉正八边形以外的所有线。
小提示
- 用正方形的纸可以很轻松的折出一个正八边形。
- 如果你想画出一个标准的正八边形，那么画的时候一定要精确。
警告