# The base of S is an elliptical region with boundary curve 9x^2 + 4y^2 = 36. Cross-sections perpendicular to the x-asis are isosceles right triangles with hypotenuse in the base.

The base of S is an elliptical region with boundary curve $9{x}^{2}+4{y}^{2}=36$. Cross-sections perpendicular to the x-asis are isosceles right triangles with hypotenuse in the base.
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