θ = 90, r = 1/2×(2560/400), (2880 π) / (θ r cos((π θ)/360) + θ r sin((π θ)/360))θ = 90, r = 1/2×(2560/400), (2880 π) / (θ r cos((π θ)/360) + θ r sin((π θ)/360))

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