數學一問？？？快！！！！！！！！！一個正ｎ邊形每個內角的大小是每個外角的９倍，求ｎ的值？？？？？ ｈｅｌｐ
回答 (2)
2008-04-10 4:06 am
✔ 最佳答案
180(n-2) / n = 360*9/n180n-360 = 3240
180n = 3600
n = 20
This is a 20-sided polygon
2008-04-10 2:15 am
((n-2)*180)/n=9(360/n)
(180n-360)/n=3240/n
180n-360=3240
180n=3600
n=20
2008-04-10 17:45:56 補充：
So,this is a 20-sided polygon.
(180n-360)/n=3240/n
180n-360=3240
180n=3600
n=20
2008-04-10 17:45:56 補充：
So,this is a 20-sided polygon.
收錄日期: 2021-04-13 18:28:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080409000051KK01730