題目如下:
16 Draw all diagonals in a regular eight-sided polygon.
What is the largest number of diagonals that meet in a single point?
(A)2
(B)3
(C)4
(D)5
(E)6
我對題目的判讀是 一個正八邊形中 一個頂點上最多會有幾條線聚集?
我的想法是
八個點中任選一點 本身點之外加上鄰近兩點不算 其他五點各出一條線
所以是任何一點最多可以有5條線聚集
書上給的答案卻是給C
無法理解為什麼 請各位指教 謝謝
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