已知弦长818,弦高779,半径819,求圆心角和弧长

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已知弦长818,弦高779,半径819,求圆心角和弧长
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已知弦长818,弦高779,半径819,求圆心角和弧长
已知弦长818,弦高779,半径819,求圆心角和弧长

已知弦长818,弦高779,半径819,求圆心角和弧长
已知弦长L=818,弦高H=779,求圆心角A和弧长C
R^2=(R-H)^2+(L/2)^2
R^2=R^2-2*H*R+H^2+(L/2)^2
2*H*R=H^2+(L/2)^2
R=H/2+L^2/(8*H)
=779/2+818^2/(8*779)
=496.869
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((818/2)/496.869)
=110.8度
=110.8*PI/180
=1.9339弧度
C=A*R
=1.9339*496.869
=906.889
已知弦高H=779,半径R=819,求圆心角A和弧长C
L=2*(R^2-(R-H)^2)^0.5
=2*(819^2-(819-779)^2)^0.5
=1636.045
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((1636.045/2)/819)
=174.4度
=174.4*PI/180
=3.044弧度
C=A*R
=3.044*819
=2492.9
已知弦长L=818,半径R=819,求圆心角A和弧长C
A=2*ARC SIN((L/2)/R)
=2*ARC SIN((818/2)/819)
=59.919度
=59.919*PI/180
=1.0458弧度
C=A*R
=1.0458*819
=855.45

圆心角A=2arccos(779/819)=2×18°=36°=π/5
弧长L=AR=(π/5)×819=163.8π