撞球......好像只能45度角發球
45度角的球很簡單,在沒有摩擦力的情況下,你會發現其實最小的轉折也會跨過兩個區隔
(設1╳N就可以明白)
所以HIT點一定是在離發球點偶數點的位置
故長╳寬為偶數的話,必進B或D袋
而長╳寬為奇數的話,必進C袋
那何時進A袋呢?impossible!
以鏡射畫圖就可知,若要進A袋也必須是偶數,但在進A袋之前一定會經過C袋
所以永遠沒機會進A袋
還有,它有解說哦,只是在另一個網頁:(全是英文哦∼∼∼

)
This applet allows students to explore the game of Paper Pool in which a ball leaves a corner at 45° and continues on until landing in a pocket. For an example of a mathematics investigation using this interactive math tool, see the
Paper Pool i-Math Investigation.
PS:我喜歡第二十六個數字棋盤(Product Game)的遊戲,只可惜沒辦法連線對戰
