如果一個正20面體的內接圓半徑為1,找正20面體體積?
最好有步驟
更新1:
上面是2條唔同的問題 不是同一個正20面體
數學問題:正20面體體積
回答 (3)
2008-03-25 10:52 am
✔ 最佳答案
用http://zh.wikipedia.org/w/index.php?title=%E6%AD%A3%E5%A4%9A%E9%9D%A2%E9%AB%94&variant=zh-hk裡面的公式：圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron.jpg
其中a是指正多面體的邊長。
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron1.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron2.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron3.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron4.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron5.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron6.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron7.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron8.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/regularicosahedron/regularicosahedron9.jpg
參考: http://zh.wikipedia.org/w/index.php?title=%E6%AD%A3%E5%A4%9A%E9%9D%A2%E9%AB%94&variant=zh-hk + my maths knowledge
2008-03-23 2:10 am
如果一個正20面體的外接圓半徑為1,找正20面體體積?
如果一個正20面體的內接圓半徑為1,找正20面體體積?
如果一個正20面體的內接圓半徑為1,找正20面體體積?
2008-03-23 1:48 am
根本不知正20面體是怎樣的, 可否晝出來看看?
Best regards,
Samson So
Best regards,
Samson So
收錄日期: 2021-04-19 00:43:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080322000051KK02328