PART IV

GEOMETRY

I. PLANE GEOMETRY 259

II. DIDACTIC MATERIAL USED FOR GEOMETRY 265 Squares and Divided Figures 265 Fractions 267 Reduction of Common Fractions to Decimal Fractions 273 Equivalent Figures 277 Some Theorems Based on Equivalent Figures 282 Division of a Triangle 289 Inscribed and Concentric Figures 290

III. SOLID GEOMETRY 292 The Powers of Numbers 294 The Cube of a Binomial 295 Weights and Measures 295