Answer :

(1) We know that area of circle = πr^{2}

Here area of circle = 176cm

(2) Here area of circle = 394.24 sq cm

r = 11.2 cm

D = 2r = 2(11.20) = 22.4 cm

(3) Here area of circle = 12474 sq cm

D = 2r = 2(63) = 126cm

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