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

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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:

a) the region bounded above by y = cos x, below by y = sin x, and on the left by +6 y-axis.

8. For the volume of the solid formed when the region described is revolved about the x-axis using washers or disks: {see attachment for regions}.

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##### Solution Summary

Cross sections, areas of bounded region and solid of revolution for washers or Disks are investigated and discussed. The solution is detailed and well presented.

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