註冊新用戶,開通自己的個人中心
討論區
王國長老
返回頂部
大宅
原帖由 ZZdaphne 於 10-5-23 00:54 發表 find the number of sides of a regular polygon if each of its interior angle is 22 degree more than that of a nonagon. ans:20 how to prove that? thanks all!!!
原帖由 BillyM 於 10-5-23 10:44 發表 size of each int angle of a nonagon: (9-2) x 180 / 9 = 140 size of each int angle of this unknown n-gon: 140 + 22 = 162 sum of all int angles of this n-gon: (n - 2) x 180 = 162 x n n = 20 == O ...