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I have posted a link there to this thread so the OP can view my work.Volumes of solids of revolution?

I have a problem in calculus 2 the question is:

"Find the volume V of the described solid S.

The base of S is the triangular region with vertices (0, 0), (4, 0), and (0, 4). Cross-sections perpendicular to the y-axis are equilateral triangles."

I drew a picture of the triangle but don't know how to find the volume. I know that because the cross sections are perpendicular to the y-axis that means it is rotated about the y-axis to get the solid and that the equations of the three lines that make up this triangle are y=0, x=0, and y= -x+4. I read the explanation to a similar problem but it made no sense and didn't help me with figuring out the answer to my problem. What's the answer? How do I solve it?