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  1. radius r = 20 cm

    area = pir^2 = 3,14400 = 1256 cm^2

    circumference = 2pir = 23,1420 = 136 cm

    2. radius = 8 cm 

    area = 3,148^2 = 3,1464 = 200,96 cm^2

    circumference = 23,148 = 50,24 cm

    3. radius = 1 cm 

    area = 3,141^2 = 3,141 = 3,14 cm^2

    circumference = 2pir = 23,141 = 6,28 cm

    hope these will help you

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