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d = √(luas : (1/4π))
d = √(346,5 : 22/28)
d = √(346,5 x 28/22)
d = √441
d = 21 cm
b.
d = √(78,5 : 3,14/4)
d = √(78,5 x 4/3,14)
d = √100
d = 10 cm