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### Inhoudsopgave

 INTRODUCTION 7 MATHEMATICAL TERMS 14 PARALLEL LINES 27 TRIANGLES 34 EQUALITY OF TRIANGLES 41 RELATION BETWEEN THE PARTS OF A TRIANGLE 48 POLYGONS 54 PARALLELOGRAMS 60
 BOOK III 85 RELATIVE POSITION OF CIRCLES 97 PROBLEMS IN CONSTRUCTION 107 EXERCISES IN INVENTION 124 PROPORTIONAL LINES 140 RELATION OF POLYGONS 160 EXERCISES IN INVENTION 177 RELATION BETWEEN THE CIRCUMFERENCE AND 183

### Populaire passages

Pagina 14 - Things which are equal to the same thing, are equal to each other. 2. If equals are added to equals, the sums are equal. 3. If equals are subtracted from equals, the remainders are equal. 4. If equals are added to unequals, the sums are unequal.
Pagina 136 - AA' and BB' be perpendicular to line CD, the projection of line AB upon line CD is line A'B'. PROP. XXV. THEOREM 277. In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides, minus twice the product of one of these sides and the projection of the other side upon it.
Pagina 85 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Pagina 44 - If two triangles have two sides of the one respectively equal to two sides of the other, and the included angles unequal, the triangle which has the greater included angle has the greater third side.
Pagina 83 - In a series of equal ratios, the sum of the antecedents is to the sum of the consequents as any antecedent is to its consequent.
Pagina 14 - Axioms. 1. Things which are equal to the same thing are equal to each other. 2. If equals are added to equals, the wholes are equal. 3. If equals are taken from equals, the remainders are equal.
Pagina 75 - To indicate that the ratio of A to B is equal to the ratio of C to D...
Pagina 123 - Upon a given straight line to describe a segment of a circle, which shall contain an angle equal to a given rectilineal angle.
Pagina 55 - A polygon of three sides is a triangle ; of four, a quadrilateral; of five, a pentagon ; of six, a hexagon ; of seven, a heptagon; of eight, an octagon; of nine, a nonagon; of ten, a decagon; of twelve, a dodecagon.
Pagina 149 - If two polygons are composed of the same number of triangles, similar each to each and similarly placed, the polygons are similar.