1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm ...1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm2.如果圆的半径长r是1㎝,那么180度的圆心角所对的弧长是几厘米

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1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm ...1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm2.如果圆的半径长r是1㎝,那么180度的圆心角所对的弧长是几厘米
1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm ...
1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm
2.如果圆的半径长r是1㎝,那么180度的圆心角所对的弧长是几厘米

1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm ...1.如果圆的半径长r是46厘米,那么18度的圆心角所对的弧长l=( )cm2.如果圆的半径长r是1㎝,那么180度的圆心角所对的弧长是几厘米
l=nπr/180=18π46/180=4.6π
l=nπr/180=1π180/180=π

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