The base of a solid is the region bounded by the parabola $\displaystyle y=\frac {1}{2}x^2$ and the line y = 2.Each plane section of the solid perpendicular to the y-axis is an equilateral triangle.Find the volume of the solid.

I did not understand the line "Each plane ............ equilateral triangle"

What shape does the solid have?

I have drawn the graph, but volume of which solid is it asking?