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" A regular pyramid is one whose base is a regular polygon and whose vertex lies in the perpendicular erected at the center of the base. "
Modern Engineering Practice: A Reference Library... - Page 62
by American School (Chicago, Ill.) - 1906
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The First Six Books of the Elements of Euclid, with a Commentary and ...

Euclid, Dionysius Lardner - Euclid's Elements - 1828 - 542 pages
...quadrangular or polygonal, according as the base is triangular, quadrangular or polygonal. (115) DBF. — A regular pyramid is one whose base is a regular polygon, and whose vertex is so placed that a perpendicular drawn from it to the plane of the base will meet that plane in the...
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Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1857 - 242 pages
...is triangular, quadrangular, &c., according as the base is a triangle, a quadrilateral,. &c. , 13. A regular pyramid is one whose base is a regular polygon, and the perpendicular let fall from the vertex upon the base, passes through the center of the base. This...
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Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1858 - 256 pages
...pyramid is triangular, quadrangular, &c., according as the base is a triangle, a quadrilateral, &c. 13. A regular pyramid is one whose base is a regular polygon, and the perpendicular let fall from the vertex upon the base, passes through the center of the base. This...
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Elements of Geometry, and Plane and Spherical Trigonometry: With Numerous ...

Horatio Nelson Robinson - Geometry - 1860 - 468 pages
...Altitude of a pyramid is the perpendicular distance from its vertex to the plane of its base. 12. A Right Pyramid is one whose base is a regular polygon, and whose vertex is in the perpendicular to the base at its center. This perpendicular is called the axiť of the pyramid....
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Primary Elements of Plane and Solid Geometry: For Schools and Academies

Evan Wilhelm Evans - Geometry - 1862 - 116 pages
...penBOOK III. 87 tagonal, etc., according as their bases are triangles, quadrilaterals, pentagons, etc. 2. A regular PYRAMID is one whose base is a regular polygon, and the triangular faces are equal and isosceles. 3. A CONE is a solid described by the revolution of a...
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Treatise on Plane and Solid Geometry: For Colleges, Schools and Private ...

Eli Todd Tappan - Geometry, Modern - 1864 - 288 pages
...demonstration is like that of analogous propositions in triangles and tetraedrons. REGULAR PYRAMIDS. 657. A REGULAR PYRAMID is one whose base is a regular polygon, and whose vertex is in the line perpendicular to the base at its center. 658. Corollary. — The lateral edges of a...
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Treatise on Geometry and Trigonometry: For Colleges, Schools and Private ...

Eli Todd Tappan - Geometry - 1868 - 432 pages
...demonstration is like that of analogous propositions in triangles and tetraedrons. REGULAR PYRAMIDS. 657. A REGULAR PYRAMID is one whose base is a regular polygon, and whose vertex is in the line perpendicular to the base at its center. 658. Corollary. — The lateral edges of a...
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A Treatise on Elementary Geometry: With Appendices Containing a Collection ...

William Chauvenet - Geometry - 1871 - 380 pages
...are triangles), is a tetraedron ; and any one of its faces may be taken as its base. 41. Definitions. A regular pyramid is one whose base is a regular polygon, and whose vertex is in the perpendicular to the base erected at the centre of the polygon. This perpendicular is called...
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Elements of Geometry, Conic Sections, and Plane Trigonometry

Elias Loomis - Geometry - 1871 - 302 pages
...pyramid is triangular, quadrangular, &c., according as the base is a triangle, a quadrilateral, &c. 13. A regular pyramid is one whose base is a regular polygon, and the perpendicular let fall from the vertex upon the base, passes through the center of the base. This...
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A Treatise on Elementary Geometry: With Appendices Containing a Collection ...

William Chauvenet - Geometry - 1872 - 382 pages
...are triangles), is a tetraedron; and any one of its faces may be taken as its base. 41. Definitions. A regular pyramid is one whose base is a regular polygon, and whose vertex is in the perpendicular to the base erected at the centre of the polygon. This perpendicular is called...
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