數學知識交流---畫正八邊形
回答 (4)
2011-10-26 7:31 pm
✔ 最佳答案
先畫一個『井』字, 直綫三段而每段例如二厘米, 橫綫三段亦是每段例如二厘米, 然後將每條綫頂點連起就可畫到一個正八邊形.不過我尚未用量角器量每個角的角度是否一樣.
祇是驟眼看好像是等角的.
2011-10-26 9:36 am
畫一個圓~畫一條半徑
一次+45度
就可以做出來
2011-10-26 14:11:01 補充：
002回答者 ..我實際將您的做法畫出..那不會是正8邊形
一次+45度
就可以做出來
2011-10-26 14:11:01 補充：
002回答者 ..我實際將您的做法畫出..那不會是正8邊形
2011-10-19 12:58 am
Then can you post us a picture for that ?
2011-10-13 1:05 am
if i want to draw square root 2
i can draw a right angled triangle with 1cm sides.
then i can get i line with 1.414...cm
if i want to draw a 1.414cm line again,
can i just mark 1.414... on the ruler,
then use the mark to draw 1.414cm later?
i can draw a right angled triangle with 1cm sides.
then i can get i line with 1.414...cm
if i want to draw a 1.414cm line again,
can i just mark 1.414... on the ruler,
then use the mark to draw 1.414cm later?
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111011000051KK00898