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### Innhold

 Fractions page 3 Decimals 11 Conversion of decimal fractions to vulgar fractions Accuracy 18 Averages Square Roots 32 Symbolical Representation 42 Directed Numbers 51 Directed Numbers 59 Indices Common Logarithms 69
 Congruent and Similar Triangles 216 Mensuration Simple Areas 227 The Midordinate Rule 237 Graphs Interpolation 244 Graphs with Directed Numbers The 252 Use of directed numbers on graphs Algebraic graphs The straight 259 Volumes and Surface Areas Prisms 275 Theorem of Pythagoras Applications 284

 Use of Logarithms 80 Use of Logarithms 90 Algebraic Division Identities 105 Algebraic Factors 115 Further Factors Fractional 125 Simple Equations 132 Literal Equations 141 Manipulation of Formulae 148 Simultaneous Equations 159 Problems on Simultaneous Equations 169 Variation 178 Quadratic Equations 187 Use of Geometrical Instruments page 197 Triangles and Polygons 207
 Mensuration of Frusta and Spheres 295 Trigonometric Ratios page 302 Trigonometric Ratios for Special 311 Problems on Heights and Distances 322 Trigonometric Identities 330 Solution of Triangles by the Sine 338 Circular Measure Angular Velocity 345 Simultaneous Equations Graphical 353 Determination of Laws 360 Solution of Quadratic Equations 369 Revision Examples on Part 1 379 Revision Examples on Part 2 393 Index 405