扇形面积的大小请选择CBA9D4C/r(X8_;[7b;c8p2d7j
A．只与半径有关;[7b;c8p2d7j
B．只与圆心角有关;[7b;c8p2d7j
C．和圆心角大小、半径的长短都有关;[7b;c8p2d7j