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400.0
r = sqrt(400/pi) = 11.3 cm
397.0
That depends on what place you want it rounded to. -- To the nearest tenth . . . . . . . . . 380.8 -- To the nearest whole number . . 381 -- To the nearest ten. . . . . . . . . . . 380 -- To the nearest hundred. . . . . . . 400 -- To the nearest thousand. . . . . . zero
400