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5 * 1/2 * (4/sin(36 deg))^2 * sin(72 deg) - (1/2 * pi * 4/sin(36 deg)^2)
5 * 1/2 * (4/sin(36 deg))^2 * sin(72 deg) - (1/2 * pi * 4/sin(36 deg)^2)
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