694.385×20.60/2-67.416×(20.60/2)^2/2
    694.385×2060/2-67.416×(2060/2)^2/2
    694.385-20.6×67.416/2
    694.385×(3×20.60)/8-67.416×((20.60×3)/8)^2/2
    694.385×20.60/8-67.416×((20.60×3)/8)^2/2
    694.385×20.60/8-67.416×(20.60/4)^2/2
    694.385-20.6×(3×67.416)/8
    694.385×20.60/8-67.531×(20.60/4)^2/2
    694.385-20.6×67.416/4
    694.385×20.60/8-67.416×(20.60/8)^2/2
    695.569×2060/8-67.531×(2060/8)^2/2
    （694.385×2060/8）-67.416×(2060/8)^2/2
    694.385×2060/8-67.416×(2060/8)^2/2
    178804.1375-694.385×(2060/8)^2/2
    694.385×2060/8
    694.385×2060/8-694.385×(2060/8)^2/2
    25*3.14
    113.04/3.14
    8*16
    arccos0.9576

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