 | Charles Austin Hobbs - Geometry, Solid - 1921 - 216 pages
...in a lune is equal to twice the number of degrees in the angle of the lune. Proposition 342 Theorem The area of a zone is equal to the product of its altitude and the circumference of a great circle. Use a method of proof similar to that used in Prop. 341. COR. I. Let Z denote the area of a zone, h... | |
 | Robert Franklin Anderson - Arithmetic - 1921 - 348 pages
...equal to the product of its altitude and the perimeter of the base. 2. The lateral area of a cylinder is equal to the product of its altitude and the circumference of the base. Formulae. If H is the number of units in the altitude of a prism (see page 250) and P the... | |
 | Baltimore (Md.). Department of Education - Mathematics - 1924 - 182 pages
...lune in spherical degrees is equal to twice the number of angular degrees in the angle of the lune. 3. The area of a zone is equal to the product of its altitude and the circumference of a great circle of the sphere. 4. The volume of a spherical sector is equal to one third the product of its radius... | |
| |
The area of a zone is equal to the product of its altitude and the circumference of a great circle. 
