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3 上. 18 平行和垂直. 6. 10. (a) 上圖中,共有平行線 對。. 3 上. 18 平行和垂直. 6. (b) 在上圖中減少一條直線,平行線的數 量便會減少 對。. 4. 減少:. 共有平行線 6 對。. 10 - 6. = 4 (對 ). 3 上. 18 平行和垂直. 6. 如果加畫的一條線垂直穿過所有線,互相垂直的線的數量便最多。. (c) 在上圖中加畫一條直線,最多可得出 互相垂直的線 對。. 5.

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6

3上

18平行和垂直

6.

10

(a) 上圖中,共有平行線對。


6

3上

18平行和垂直

6.

(b) 在上圖中減少一條直線,平行線的數

量便會減少對。

4

減少:

共有平行線 6 對。

10-6

= 4(對)


6

3上

18平行和垂直

6.

如果加畫的一條線垂直穿過所有線,互相垂直的線的數量便最多。

(c) 在上圖中加畫一條直線,最多可得出

互相垂直的線對。

5


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