Theorem. The convex surface of a truncated cone A D E B it equal to its side A D multiplied by half the sum of A B, D E, the circumferences of its two bases, fig. 219 In the plane SAB which passes through the axis Kg. 21 9-- S O, draw the lineanbsp;...
|Title||:||Encyclopaedia of pure mathematics|
|Author||:||Peter Barlow, George Peacock, Dionysius Lardner, Sir George Biddell Airy, H. P. Hamilton, A. Levy, Augustus DeMorgan, Henry Mosley|