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First Practical Lines in Geometrical Drawing: Containing a Copious Series of ...
J. F. H. de Rheims
Uten tilgangsbegrensning - 1865
75 inch angle of 30 angle of 45 axis base bisect chords circumference compass cone Construct a scale contours cube curve cutting cylinder describe a circle describe the arc Descriptive Geometry determine the point diagram diameter dihedral angle divided draw a line ellipse English yards equilateral triangle feet long foot forming an angle furlongs given line given point ground line hand plane height horizontal plane horizontal projection inch side inches edge inches high inches long intersection isometric projection join length miles object obtained parallel to x y parallelogram pentagon pentagonal pyramid perpendicular to x y perspective picture plane plane inclined planes of projection polygon position primary division prism protractor pyramid radius ray of light representative fraction rhombus right angles sector shadow solid space square square pyramid straight line tangent tetrahedron tical tion versts vertical plane
Side 15 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles.
Side 15 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Side 15 - If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite angle on the same side; and also the two interior angles on the same side together equal to two right angles.
Side 16 - IF a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight line which joins the points of section shall be parallel to the remaining side of the triangle...
Side 67 - A cone is a solid figure described by the revolution of a right-angled triangle about one of the sides containing the right angle, which side remains fixed.
Side 67 - A prism is a solid figure contained by plane figures, of which two that are opposite are equal, similar, and parallel to one another ; and the others parallelograms. XIV. A sphere is a solid figure described by the revolution of a semicircle about its diameter, which remains unmoved.
Side 68 - The base of .a cone is the circle described by that side containing the right angle which revolves.
Side 16 - In equal circles, angles, whether at the centres or circumferences, have the same ratio which the circumferences on which they stand have to one another ; so also have the sectors.