Ononot — A bubble chart displays variables (X, Y, Z) where the area A

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Data Visualizationhard

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A bubble chart displays variables $(X, Y, Z)$ where the area $A$ of the bubble is proportional to $Z$ . If Bubble 1 has radius $r_1$ and $Z_1 = 100$ , and Bubble 2 has $Z_2 = 400$ , what is the relationship between their radii $r_1$ and $r_2$ ?