一道普通初中題目：求邊長 10 cm 的正四面體（tetrahedron）之總表面面積
不難計出一個三角形面積為 
可是，有些學生給的答案是
明顯，他們誤以為 
在二維面上表達三維物件，不一定「眼看為真」；要以「高一層次」的眼光，才能超越表象，還原本相。
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