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So the c.s.a. of hemisphere= 2772cm^2...so 2πr^2=2772 =>2*22/7*r^2 =2772 => 44/7 *r^2 =2772 => r^2 = 2772*7/44 => r^2 = 441 =>r =21cm..so total surface area of the solid => 3πr^2 = 3*22/7*21*21 =4158cm^2
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Hope it helps you rabia
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