We see a Ying Yang sign as a religious symbol . But if someone was to construct it on a building , then he'd surely have to paint the black portions . Help this guy by calculating him the money ( in dollars ) that he'll need to paint the black parts of his Yin Yang sign . ( Given that it costs 12 dollars to paint an area of 1 sq. m and the radius of the sign is 7 m .The two circles and the curvatures are equal )

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