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### Περιεχόμενα

 Book IV 73 BookV 87 Book VI 111 GEOMETRY OF PLANES AND SOLIDS 138 Perpendicularity 158 Oblique Line and Plane 174 Trihedral and Polyhedral Angle 181 Equality and Symmetry of Trihedral Angles 189
 Exercises on Orthographic Projection 271 Traces of Planes 277 Orthograph Representation of a Point 283 Constructions relating to the Plane Line and Point 290 Exercises 316 Shadows 324 Light and Shade 332 General Principles 339

 Cone Cylinder and Sphere 205 CONIC SECTIONS 221 Ellipse 227 Hyperbola 235 Definitions and First Principles 272 240 Orthographic Projection 244
 Planes 349 PERSPECTIVE 357 Practical Perspective 366 Miscellaneous Propositions 373 Isometric Projection 379

### Δημοφιλή αποσπάσματα

Σελίδα 19 - That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Σελίδα 35 - If a straight line be divided into two equal parts, and also into two unequal parts ; the rectangle contained by the unequal parts, together with the square on the line between the points of section, is equal to the square on half the line.
Σελίδα 4 - AB; but things which are equal to the same are equal to one another...
Σελίδα 128 - EQUIANGULAR parallelograms have to one another the ratio which is compounded of the ratios of their sides.* Let AC, CF be equiangular parallelograms, having the angle BCD equal to the angle ECG : the ratio of the parallelogram AC to the parallelogram CF, is the same with the ratio which is compounded of the ratios of their sides. Let BG, CG, be placed in a straight line ; therefore DC and CE are also in a straight line (14.
Σελίδα 8 - If two triangles have two sides of the one equal to two sides of the...
Σελίδα 36 - If a straight line be bisected and produced to any point, the rectangle contained by the whole line thus produced and the part of it produced...
Σελίδα 21 - BCD, and the other angles to the other angles, (4. 1.) each to each, to which the equal sides are opposite : therefore the angle ACB is equal to the angle CBD ; and because the straight line BC meets the two straight lines AC, BD, and makes the alternate angles ACB, CBD equal to one another, AC is parallel (27. 1 .) to DB ; and it was shown to be equal to it. Therefore straight lines, &c.
Σελίδα 65 - If a straight line touch a circle, and from the point of contact a straight line be drawn cutting the circle, the angles which this line makes with the line touching the circle shall be equal to the angles which are in the alternate segments of the circle.
Σελίδα 4 - Magnitudes which coincide with one another, that is, which exactly fill the same space, are equal to one another.
Σελίδα 116 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.