Inside Angle = 140

送交者: 零加一中 2020月03月16日07:57:10 於 [靈機一動] 發送悄悄話

回  答: 趣味的數學-282 由 gugeren 於 2020-03-13 18:55:41

Sum of inside angle = 7 X 180. Inside angle = 140. a and b has angle 20. a cos 20 = b/2 b and d has angle 50. b cos 50 = d/2

0%(0)

對！是a+b=d　/無內容 - gugeren 03/16/20 (161)

	標  題 (必選項): 內  容 (選填項):

	實用資訊