Ononot — In a 3D bubble chart, the visual area A is proportional to t

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Data Visualizationhard

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In a 3D bubble chart, the visual area $A$ is proportional to the data value $z$ . If bubble A has radius $r_A$ representing $z_A = 100$ and bubble B has radius $r_B = 2r_A$ , what value $z_B$ does bubble B represent?