已知扇形的圆心角为80°，半径为3cm，则扇形的弧长是43π43πcm，扇形的面积是cm2．

Question

已知扇形的圆心角为80°，半径为3cm，则扇形的弧长是

(4)/(3)π

(4)/(3)π

cm，扇形的面积是______cm²．

(4)/(3)π

(4)/(3)π(4)/(3)4433

(4)/(3)π

(4)/(3)π(4)/(3)4433²

Answer 1

扇形的弧长是L=(80π×3)/(180)=(4)/(3)π；
扇形的面积是 (80)/(360)πr²=2πcm²．
故答案为：(4)/(3)π，2π． (80π×3)/(180)80π×380π×380π×3180180180=(4)/(3)π；
扇形的面积是 (80)/(360)πr²=2πcm²．
故答案为：(4)/(3)π，2π． (4)/(3)444333π；
扇形的面积是 (80)/(360)πr²=2πcm²．
故答案为：(4)/(3)π，2π． (80)/(360)808080360360360πr²2=2πcm²2．
故答案为：(4)/(3)π，2π． (4)/(3)444333π，2π．