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弓形面积计算,玄长为32.4M,高为10.78,急

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弓形面积计算,玄长为32.4M,高为10.78,急
弓形面积计算,玄长为32.4M,高为10.78,急
玄长:L=32.4m
弓高:H=10.78m
圆半径R=L²/(8*H)+H/2
=32.4²/(8*10.78)+10.78/2
=1049.76/86.24+5.39
= 12.17+5.39
=17.56m
中心角A=2*arcsin(L/(2*R))
=2*arcsin[32.4/(2*17.56)]
=2*arcsin0.92
=2*66.93
=133.86
面积S=π*R²*A/360-L*(R-H)/2
=π*17.56²*133.86/360-32.4*(17.56-10.78)/2
=π*114.66-109.836
=360.215-109.836
=250.379m²