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If a rectangle is rotated about the y-axis as shown below, what three-dimensional polyhedral would be formed?
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Rectangular prism Cone Cylinder Square pyramid
A cylinder, imagine a point on the outer edge only- it will trace a circle, so the outer edge is made of circles of the same radius. Likewise, the lines on the top and bottom trace out disks, so the endcaps are disks, hence a cylinder.
thank you so much @felis
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