### Cross Section, Bounded Region, Solid of Revolution - Washers or Disks

6. Sketch the region and then find the volume of the solid whose base is the given region and which has the property that each cross section to the x-axis is an equilateral triangle a) the region bounded by the curves {see attachment} 7. Same problem statement as #6 above, except cross-section to the x-axis is a semi-circle: