P * (h * sin^2(a/2) + R * sin(a)); a = 0.643501; P = 2430*pi*9.81; h = 2; R = 0.75P * (h * sin^2(a/2) + R * sin(a)); a = 0.643501; P = 2430*pi*9.81; h = 2; R = 0.75

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