# Key to System of practical mathematics. 2 pt. No.xvii

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### Περιεχόμενα

 Valuation of Algebraic Expressions 2 Greatest Common Measure 11 Simple Equations 19 49 10 56 18 Analytical Trigonometry 28 Mensuration of Surfaces 38
 and X 56 Problem XIV 62 and III 69 Problem XII 75 and XV 85 82 108

### Δημοφιλή αποσπάσματα

Σελίδα 74 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Σελίδα 75 - If the vertical angle of a triangle be 'bisected 'by a straight line which also cuts the base, the rectangle contained by the sides of the triangle is equal to the rectangle contained by the segments of the base, together with the square on the straight line which bisects the angle.
Σελίδα 9 - Let x measure у by the units in n, then it will measure cy by the units in nc. 2d. If a quantity measure two others, it will measure their sum or difference. Let a be contained...
Σελίδα 15 - ... sin(a + b + c). Again (a) represents the coarse ROM, and bands b and c are two controls of the fine-tuned ROMs so that a < 90°, b < 90 • 2~a and c < 90 • 2~(a + 6). This is shown in Fig. 7-7. Sunderland showed that the trigonometric identity can be written as sin(a + b + c) = sin(a + 6) cos c + cos a cos b sin...
Σελίδα 10 - The truth of this rule depends upon these two principles ; 1". If one quantity measure another, it will also measure any multiple of that quantity. Let x measure y by the units in n, then it will measure cy by the units in nc.
Σελίδα 139 - Arc, on the Sine and Cosine of an Arc in terms of the Arc itself, and a new Theorem for the Elliptic Quadrant.
Σελίδα 137 - The differential of the logarithm of a function is equal to the differential of the function, divided by the function itself.
Σελίδα 149 - The pyramid may be conceived to be made up of an infinite number of planes parallel to ABC.
Σελίδα 81 - ... sum of any number of quantities is equal to the sum of the corresponding functions of each of these quantities, will be called distributive
Σελίδα 86 - We thus derive the following method for multiplying two binomials which have a common first term : The first term of the product is the square of the common first terms of the binomials.