| Euclid, Robert Simson - 1892 - 518 sider
...the right'angled triangle in any one of its positions is called a generating line of the cone. 25. **Similar cones and cylinders are those which have their...axes and the diameters of their bases proportionals,** PROPOSITION 1. THEOREM. One part of a straight line cannot be in a plane and another part outside it.... | |
| Euclid, H. S. Hall, F. H. Stevens - 1904 - 456 sider
...the right-angled triangle in any one of its positions is called a generating line of the cone. 25. **Similar cones and cylinders are those which have their...axes and the diameters of their bases proportionals.** PROPOSITION 1. THEOREM. One part of a straight line cannot be in a plane and another part outside it.... | |
| R. H. Warn, J. G. Horner - 2002 - 284 sider
...a cylinder are the circles described by the two revolving opposite sides of the parallelogram. 66. **A tetrahedron is a solid figure contained by four equal and equilateral triangles.** 67. An octahedron is a solid figure contained by eight equal and equilateral triangles. 68. A parallelopiped... | |
| 1956 - 432 sider
...diameters of the bases are proportional. 25. A cube is a solid figure contained by six equal squares. 26. **An octahedron is a solid figure contained by eight equal and equilateral triangles.** 27. An icosahedron is a solid figure contained by twenty equal and equilateral triangles. 28. A dodecahedron... | |
| |