tanarccos0.75
    tanarccos0.75*630
    tanarccos0.75
    900*tan(arccos0.8)
    900*6
    900×tan(arccos0.8)
    900×tan(arccos0.8)
    900×tan(arccos0.8)
    arccos0.75
    arccos0.8
    249.6×1.78+2×16.3×√1.78
    221.4×1.78+2×16.3×√1.78
    221.4×1.482+2×13.8×√1.482
    102.6×1.482+2×13.8×√1.482
    102.6×1.729+2×24.4×√1.729
    75.6×1.729+2×24.4×√1.729
    75.6×1.42+2×10×√1.42
    0×1.42+2×10×√1.42
    221.4+18.8×1.5
    102.6+18×6.6

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