Sкруга = пR^2 = 4,5^2 * 3.14 = 63,585 см2
С= 2пR= 6,28*4,5=28,26 см
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Sкруга = пR^2 = 4,5^2 * 3.14 = 63,585 см2
С= 2пR= 6,28*4,5=28,26 см