Volumes of Solids by Cross-Section

Which expression represents the vertical distance between both curves anywhere within the shaded region?

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Which expression represents the area of any square within the shaded region whose base is perpendicular to the x-axis?

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Which expression represents the volume of a solid created by an infinite amount of squares whose bases are perpendicular to the x-axis?

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Which expression represents the radius of any circle within the shaded region whose diameter is perpendicular to the x-axis?

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Which expression represents the area of any semicircle within the shaded region whose diameter is perpendicular to the x-axis?

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Which expression represents the volume of a solid create by an infinite amount of semicircles whose diameter is perpendicular to the x-axis?

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