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Geometry 9 Online
OpenStudy (anonymous):

Which 2-dimensional shape can be rotated about the y-axis to create a cylinder which has a smaller diameter than height?

OpenStudy (mathmale):

I'd start with a diagram, and hope you will too. If a cylinder is created by this rotation of a shape around the y-axis, then the shape is rectangular. Draw such a rectangle and label its width and height. How is the width of this rectangle related to the diameter of the cylinder?

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