Diagram used to prove the theorem: “The area of the surface generated by a straight line revolving about an axis in its plane is equal to the product of the projection of the line on the axis by the circumference whose radius is perpendicular erected at the middle point of the line and terminated by the axis.”
Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
1797×2400, 307.8 KiB
766×1024, 30.9 KiB
479×640, 17.4 KiB
239×320, 7.3 KiB