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Lamina $D$ berada di atas sumbu-$y$ dan dibatasi oleh kurva $y=\\sqrt{1-x^2}$ dan $y=\\sqrt{{\\var{a^2}}-x^2}$. Diketahui kepadatan massa lamina tersebut adalah $\\delta(r,\\theta) = \\dfrac{k}{r}$ dengan $k$ suatu konstanta. Misal pusat massa lamina tersebut adalah $(\\bar x,\\bar y)$.

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Jika massa lamina tersebut adalah $m=\\var{(a-1)*b}\\pi$, maka $k=\\ldots$.

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Momen lamina tersebut terhadap sumbu-$x$ adalah $\\ldots$.

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$\\bar x + \\bar y=\\dfrac{c}{\\pi}$ dengan $c=\\ldots$.

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