已知扇形的半径为6cm，圆心角为y=45°，则这个扇形的弧长为cm．

Answer 1

l=(nπ×R)/(180)=(45π×6)/(180)=(3)/(2)πcm．
故答案为：(3)/(2)． (nπ×R)/(180)nπ×Rnπ×Rnπ×R180180180=(45π×6)/(180)=(3)/(2)πcm．
故答案为：(3)/(2)． (45π×6)/(180)45π×645π×645π×6180180180=(3)/(2)πcm．
故答案为：(3)/(2)． (3)/(2)333222πcm．
故答案为：(3)/(2)． (3)/(2)333222．