A4紙大小是29.7x21
更新1:
回答的第一位所用的表面積不能計算的 因為不能形成四角錐體
數學-用A4紙製作最大三角錐體
回答 (4)
2010-03-12 2:29 pm
✔ 最佳答案
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron0.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron1.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron2.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron3.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron4.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron5.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron6.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron7.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron8.jpg
圖片參考：http://i212.photobucket.com/albums/cc82/doraemonpaul/yahoo_knowledge/A4andTetrahedron/A4andTetrahedron9.jpg
參考資料：
my wisdom of maths + formula from http://en.wikipedia.org/wiki/Tetrahedron#Formulas_for_regular_tetrahedron
2010-03-12 5:57 pm
Bravo!
2010-03-07 3:20 am
總表面面績:
把10.5^2+21^2 的答案開方，就是height.
(height)(21)/2
=191 cm^2 (3 s.f.)
體積: 162 cm^3 (3 s.f.)
把10.5^2+21^2 的答案開方，就是height.
(height)(21)/2
=191 cm^2 (3 s.f.)
體積: 162 cm^3 (3 s.f.)
收錄日期: 2021-04-19 21:26:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100226000051KK01622