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### Continguts

 CHAPTER I 1 ARTICLE 9 CHAPTER II 12 On Angles 17 Graphic Solution of Triangles 18 Area of a Triangle in Coördinates of Vertices 25 CHAPTER VI 44
 Arrangement of Tables of Logarithms 50 The Compound Interest Formula 59 CHAPTER VII 65 CHAPTER VIII 73 ARTICLE 82 Approximate Volumes 88

### Passatges populars

Pŕgina 55 - The logarithm of any power of a number is equal to the logarithm of the number multiplied by the exponent of the power.
Pŕgina 65 - Substitute these values into the formula for the sum of the first n terms of a geometric progression, and simplify: a -ar...
Pŕgina 4 - The square on the hypotenuse equals the sum of the squares on the other two sides.
Pŕgina 33 - The radian is the plane angle between two radii of a circle which cut off on the circumference an arc equal in length to the radius. The steradian is the solid angle which, having its vertex in the center of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.
Pŕgina 41 - ... the initial point of the first vector to the terminal point of the last is their vector sum.
Pŕgina 86 - ... bounded on one side by a straight line and on the other by a zigzag.
Pŕgina 54 - The logarithm of a quotient equals the logarithm of the dividend minus the logarithm of the divisor.
Pŕgina 57 - In a right triangle, the perpendicular from the vertex of the right angle to the hypotenuse is a mean proportional between the segments of the hypotenuse: p2 = mn. Any two similar figures, in the plane or in space, can be placed in " perspective," that is, so that lines joining corresponding points of the two figures will pass through a common point.
Pŕgina 87 - S'-A'B'C' be two triangular pyramids having equivalent bases situated in the same plane, and equal altitudes. To prove that S-ABC =0= S'-A'B'C'. Proof. Divide the altitude into n equal parts, and through the points of division pass planes parallel to the plane of the bases, forming the sections DEF, GHI, etc., D'E'F', G'H'I', etc. In the pyramids S-ABC and S'-A'B'C' inscribe prisms whose upper bases are the sections DEF, GHI, etc., D'E'F', G'H'T, etc.