 The lateral area of a frustum of a right circular cone is equal to one half the product of its slant height and the sum of the circumferences of its bases.  Solid Geometry - Page 378by John Charles Stone, James Franklin Millis - 1916 - 174 pagesFull view - About this book
 | Walter Burton Ford, Charles Ammermann - Geometry, Modern - 1923 - 406 pages
...where r is the radius of the base and I is the slant height. See §§ 319 and 214. 321. Corollary 2. The lateral area of a frustum of a right circular cone is equal to one half the product of its slant height and the sum of the circumferences of its bases. FIG. 239 [The proof... | |
 | Geometry - 100 pages
...one-half the product of the circumference of its base and the length of its slant height. A = « (2rTt) Theorem The lateral area of a frustum of a right circular cone is one-half the product of the slant height and the sum of the circumferences of the two bases. V. Spheres... | |
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