(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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