所屬主題: [初中數學] – 3-D Figures 立體圖形

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影片內容: 00:17 – Euler’s formula 歐拉公式 03:21 – duality of regular polyhedra 正多面體的對偶性 所屬主題: [初中數學] – 3-D Figures 立體圖形

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影片內容: 00:25 – line perpendicular to a plane 與平面垂直的線 01:06 – projection of a point and a line onto a plane 點和線在平面上的投影 03:06 – angle between a line and a plane 線與平面的交角 03:39 – illustrative example 1 例子 1 05:43 – line of intersection between two planes 兩個平面的交線 06:43 – angle between two planes 兩個平面的交角 […]

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影片內容: 00:05 – constructing nets of 3-D figures 繪畫展開圖 02:14 – constructing 3-D figures from their nets 分辨展開圖的對應立體 所屬主題: [初中數學] – 3-D Figures 立體圖形

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影片內容: 00:17 – why 2-D representation of 3-D figures 為何要以平面圖形表達立體圖形 00:43 – constructing orthographic views of 3-D Figures 繪畫三視圖 02:28 – sketching 3-D figures from their orthographic views 從三視圖繪畫立體圖形 所屬主題: [初中數學] – 3-D Figures 立體圖形

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影片內容: 01:09 – introduction to Euler 歐拉 所屬主題: [初中數學] – 3-D Figures 立體圖形

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