## The Elements of Descriptive Geometry ... |

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Página 16

The solids so

the Icosahedron . 2 ° . Let the equilateral polygon be a square ; then each plane

L = 90 ° ; and :: 3 x 90 = 270 < 360 , a solid angle with three right 2 $ may be ...

The solids so

**formed**are respectively called the Tetrahedron , the Octahedron ,the Icosahedron . 2 ° . Let the equilateral polygon be a square ; then each plane

L = 90 ° ; and :: 3 x 90 = 270 < 360 , a solid angle with three right 2 $ may be ...

Página 17

containing three of these Zs , may be

of Z , is called the Dodecahedron . As the interior 2 of a hexagon 120 ° , no solid

< can be

containing three of these Zs , may be

**formed**. A regular solid , which has this kindof Z , is called the Dodecahedron . As the interior 2 of a hexagon 120 ° , no solid

< can be

**formed**of the plane 28 of a regular hexagon ; and the same may be ... Página 20

The projection of a line upon a plane is the line

point of the former line . From the different points of the curve a B , let fall

perpendiculars on the plane mn ; the curve line ab ,

The projection of a line upon a plane is the line

**formed**by the projections of everypoint of the former line . From the different points of the curve a B , let fall

perpendiculars on the plane mn ; the curve line ab ,

**formed**by the feet of these ... Página

The projection of a line upon a plane is the line

point of the former line . From the different points of the curve AB , let fall

perpendiculars on the plane mn ; the curve line ab ,

The projection of a line upon a plane is the line

**formed**by the projections of everypoint of the former line . From the different points of the curve AB , let fall

perpendiculars on the plane mn ; the curve line ab ,

**formed**by the feet of these ... Página

In the other examples the question to be resolved will always be comprised in

this general enunciation : “ Two surfaces being given , to determine the curve

point .

In the other examples the question to be resolved will always be comprised in

this general enunciation : “ Two surfaces being given , to determine the curve

**formed**by their mutual intersection and to draw the tangent to it at any proposedpoint .

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### Palavras e frases frequentes

angle arcs assumed axes axis base called centre circle coincide common cone conic consequently considered construction contains corresponding curve curve of intersection cylinder described Descriptive determined developed dicular distance draw draw the tangent drawn equal evident example faces figure formed generatrixes given line given point ground line helix Hence HISTORY horizontal plane horizontal projection horizontal trace intersection length line joining lines parallel magnitude means meet moving necessary normals obtained obviously Octavo parallel perpen perpendicular plane pap plane passing planes of projection point of contact polygon position PROBLEM produced PROPOSITION radius required plane respectively right angles sides situated solid sought space sphere straight line supposed surface tangent plane third plane tion true vertex vertical plane vertical projection vertical trace

### Passagens conhecidas

Página 101 - A MANUAL of CHRISTIAN ANTIQUITIES ; or an Account of the Constitution, Ministers, "Worship, Discipline, and Customs of the Early Church ; with an Introduction, containing a Complete and Chronological Analysis of the "Works of the Antenicene Fathers.

Página 11 - If two straight lines meeting one another be parallel to two other straight lines which meet one another, but are not in the same plane with the first two; the plane which passes through these is parallel to the plane passing through the others.

Página 10 - From the same point in a given plane there cannot be two straight lines at right angles to the plane, upon the same side of it : and there can be but one perpendicular to a plane from a point above the plane.

Página 101 - HISTORY of the CHURCH of ENGLAND, to the REVOLUTION in 1688; embracing Copious Histories of the Thirty-Nine Articles, the Translation of the Bible, and the Compilation of the Book of Common Prayer.

Página 6 - IF two straight lines be parallel, the straight line drawn from any point in the one to any point in the other is in the same plane with the parallels.* Let AB, CD be parallel straight lines, and take any point E in the one, and the point F in the other : the straight line which joins E and F is in the same plane with the parallels.

Página 103 - BIBLE CYCLOPEDIA; a Comprehensive Digest of the Civil and Natural History, Geography, Statistics, and General Literary Information connected with the Sacred Writings.

Página 101 - CV. *HISTORY OF THE CHRISTIAN CHURCH ; from the Ascension of Jesus Christ to the Conversion of Constantine. By the late EDWARD BURTON, DD, Regius Professor of Divinity at Oxford.

Página 2 - A solid angle is that which is made by the meeting of more than two plane angles, which are not in the same plane, in one point. X. ' The tenth definition is omitted for reasons given in the notes.

Página 105 - Progressive Exercises in Greek Tragic Senarii, followed by a Selection from the Greek Verses of Shrewsbury School, and prefaced by a short Account of the Iambic Metre and Style of Greek Tragedy.

Página 7 - Two straight lines which are each of them parallel to the same straight line, and not in the same plane with it, are parallel to one another. Let AB...