已知圆的半径为R=5米,弧长为C=2.44米,弦长L为多少?
弧所对圆心角为A.
A=C/R
=2.44/5
=0.488弧度
=0.488*180/PI
=27.96度
L=2*R*SIN(A/2)
=2*5*SIN(27.96/2)
=2.416米
弦长L=2.416米.