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The section of a certain solid cut by any plane perpendicular to the x-axis is a square with the ends of a diagonal lying on the parabolas y^2=9x and x^2 =9y. Find its volume.

위 사진이 이해한 모형 맞나요?
빨간 마름모가 x축에 수직하게 x가 0~9까지 이동하면서 만드는 solid??