Problem with creating 3d model for calculus

Question

Hello, I am designing a 3d model to be printed on tinkercad of the volume created by slicing with rt isoscele triangles of the area between y = the sqrt(x) and y=0 on the interval [0,9]. Any tips how, especially with creating the thickness (dx)?

Answer 1

Are the sides of the isosceles triangles that make up the base of this object the legs or the hypoteneuses of the triangles?