Theorem. The convex surface of a truncated cone A D E B is equal to its side A D multiplied by half the sum of AB, DE, the circumferences of its two bases, fig. 219 In the plane SAB which passes through the axis Fig. 219.- S O, draw the line A F anbsp;...
|Title||:||Encyclopædia metropolitana; or, Universal dictionary of knowledge, ed. by E. Smedley, Hugh J. Rose and Henry J. Rose. [With] Plates|