已知圆弧半径R=3和弧高H=2.3求弧长C?
弧所对的圆心角为A.
A=2*ARC COS((R-H)/R)
=2*ARC COS((3-2.3)/3)
=153.01度
=153.01*PI/180
=2.670584弧度
C=R*A=3*2.670584=8.012