Discussion
A solid of revolution is generated by revolving a plane figure about
Answer: B
Correct answer: a fixed axis
A solid of revolution is generated by turning a plane figure through a full revolution about a fixed line in its own plane. A rectangle gives a cylinder, a right triangle a cone, and a semicircle a sphere. Every section perpendicular to that axis is therefore a circle, which is what makes such solids easy to recognise from their views.
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