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Contents

 INTRODUCTION 1 THE DEMONSTRATIONS OF GEOMETRY 9 RECTILINEAR FIGURES 21 PARALLELS AND PARALLELOGRAMS 43 PROBLEMS 67 Loci OF POINTS 80 EQUALITY OF POLYGONS 90 PROBLEMS 109
 APPENDIX TO PLANE GEOMETRY 226 CONCURRENCE AND COLLINEARITY 238 SOLID GEOMETRY 244 THE RELATIVE POSITION OF A LINE AND A PLANE 251 PENCIL OF PLANES 265 POLYHEDRAL ANGLES 274 PROBLEMS 280 PAGE 283

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Page 104 - The projection of a point on a line is the foot of the perpendicular from the point to the line. Thus A
Page 161 - The first and last terms of a proportion are called the extremes, and the two middle terms are called the means.
Page 118 - In the same circle, or in equal circles, if two arcs are equal, their central angles are equal; and conversely.
Page 147 - To draw a tangent to a given circle from a given point.
Page 202 - II, cor. 1. 2. The area of a rectangle equals the product of its base and altitude. That is, the number which represents Its square units of area is the product of the two numbers which represent its base and altitude. For in prop. II, if R' = 1, the square unit of area, then a' and 6' must each equal 1, the unit of length.
Page 186 - 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.
Page 317 - A plane surface, or a plane, is a surface in which, if any two points are taken, the straight line joining these points lies wholly in the surface.
Page 39 - If two triangles have two sides of the one respectively equal to two sides of the other, and the included angles unequal, the third sides are unequal, and the greater third side belongs to the triangle having the greater included angle.
Page 46 - Two intersecting straight lines cannot both be parallel to the same straight line.
Page 268 - Theorem. If each of two intersecting planes is perpendicular to a third plane, their line of intersection is also perpendicular to that plane. Given two planes, Q, R, intersecting in OP, and each perpendicular to plane M.