10/(ln(23/13))
    10/(ln(22/12))
    10/(ln(21/11))
    10/(ln(2))
    (250^2+570^2-790^2)/(2*570*250)
    (250^2+570^2-790^2)/2*570*250
    (250^2+570^2-790^2)-2*570*250
    (250^2+570^-790^)-2*570*250
    14/(ln(18/4))
    12/(ln(18/6))
    10/(ln(18/8))
    10/(ln(15/5))
    12/（ln（15/3））
    1+1/2+1/3+1/4+1/5
    arctan5.123513266239707e-5
    76586543*799876
    2*14.3*1000*0.45*0.45*3.14*0.45*sin(3.14*0.314)*sin(3.14*0.314)*sin(3.14*0.314)/(3*3.14159)+270*3.848*0.4*(sin(3.14*0.314)+sin(3.14*0.572))/3.14
    0.31*1.43*1000*0.5*0.5*3.14159*(1-(sin(2*3.14159*0.31))/(2*3.14159*0.31))+(3*0.31-1.25)*270*3.848
    0.31*1.43*1000*0.45*0.45*3.14159*(1-(sin(2*3.14159*0.31))/(2*3.14159*0.31))+(3*0.31-1.25)*300*3.848
    0.31*1.43*1000*0.45*0.45*3.14159*(1-(sin(2*3.14159*0.31))/(2*3.14159*0.31))+(3*0.31-1.25)*270*3.848

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