三棱錐A-BCD,求證:角BAC 小於 角BAD和角CAD的和。
所有跟帖:
• 這好像很直觀吧,把平麵BAD和CAD 壓癟到跟BAC同一個平麵就可以了 -monseigneur- ♂ (0 bytes) () 02/29/2024 postreply 23:27:52
• 這好像很直觀吧,把平麵BAD和CAD 壓癟到跟BAC同一個平麵就可以了 -monseigneur- ♂ (0 bytes) () 02/29/2024 postreply 23:27:52
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