2012年12月26日，世界上运营里程最长的高速铁路京广高铁正式开通运营，北京至广州的时间缩短至8小时左右，全线贯通28个城市。读图回答下列问题。
如图，等边三角形ABC内接于⊙O，若边长为43cm，则⊙O的半径为（ ）
I have a good friend．She is a beautiful girl．She is lovely．She has two big eyes and she's thin．Her favourite colour is red．She likes wearing(穿着)a red dress．She can sing and dance．We often(经常)play together．
— Once a week.
