Let (x, y) be the centroid of a domain D. For > 0, let D be
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Let (x̅, y̅) be the centroid of a domain D. For λ > 0, let λD be the dilation of D, defined by
λD = {(λx, λy) : (x, y) ∈ D}
Use the Change of Variables Formula to prove that the centroid of λD is (λx̅, λy̅).
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