Elements of Plane and Solid GeometryGinn, Heath, 1877 - 398 σελίδες |
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Σελίδα iii
... Hence , with a very large proportion of beginners in Geometry , it depends mainly upon the form in which the subject is presented whether they pursue the study with indifference , not to say aversion , or with increasing interest and ...
... Hence , with a very large proportion of beginners in Geometry , it depends mainly upon the form in which the subject is presented whether they pursue the study with indifference , not to say aversion , or with increasing interest and ...
Σελίδα 4
... Hence a solid extends in all direc- tions . A solid may be conceived as generated by a surface in motion . Thus , in the diagram , let the upright surface ABCD move to the right to the position EF HK . The points A , B , C , and D will ...
... Hence a solid extends in all direc- tions . A solid may be conceived as generated by a surface in motion . Thus , in the diagram , let the upright surface ABCD move to the right to the position EF HK . The points A , B , C , and D will ...
Σελίδα 6
... Hence , all straight lines which pass through the same point in the same direction coincide . Between two points one , and but one , straight line can be drawn ; that is , a straight line is determined in position if two of its points ...
... Hence , all straight lines which pass through the same point in the same direction coincide . Between two points one , and but one , straight line can be drawn ; that is , a straight line is determined in position if two of its points ...
Σελίδα 7
... Hence , every straight line , as A B , A B , has two opposite directions , namely from A toward B , which is expressed by say- ing line AB , and from B toward A , which is expressed by saying line B A. A B с 20. If a straight line ...
... Hence , every straight line , as A B , A B , has two opposite directions , namely from A toward B , which is expressed by say- ing line AB , and from B toward A , which is expressed by saying line B A. A B с 20. If a straight line ...
Σελίδα 10
... Hence the whole angular magnitude about a point in a plane is equal to four right angles , and the angular magnitude about a point on one side of a straight line drawn through that point is equal to two right angles . C B D D A E Fig ...
... Hence the whole angular magnitude about a point in a plane is equal to four right angles , and the angular magnitude about a point on one side of a straight line drawn through that point is equal to two right angles . C B D D A E Fig ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
A B C D AABC ABCD altitude apothem arcs A B axis base and altitude centre centre of symmetry chord circumference circumscribed coincide conical surface COROLLARY cylinder denote diagonals diameter dihedral angle distance divided draw equal respectively equally distant equilateral equivalent frustum given point Hence homologous sides hypotenuse intersection isosceles lateral area lateral edges lateral faces Let A B Let ABC line A B measured by arc middle point number of sides opposite parallel lines parallelogram parallelopiped perimeter perpendicular plane MN polyhedral angle prove Q. E. D. PROPOSITION radii ratio rect rectangles regular inscribed regular polygon right angles right section SCHOLIUM similar polygons slant height sphere spherical angle spherical polygon spherical triangle straight line drawn surface tangent tetrahedron THEOREM trihedral upper base vertex vertices volume
Δημοφιλή αποσπάσματα
Σελίδα 188 - Two triangles having an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles.
Σελίδα 347 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Σελίδα 134 - 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.
Σελίδα 201 - To construct a parallelogram equivalent to a given square, and having the sum of its base and altitude equal to a given line.
Σελίδα 221 - The area of a regular inscribed hexagon is a mean proportional between the areas of the inscribed and circumscribed equilateral triangles.
Σελίδα 217 - The area of a regular polygon is equal to onehalf the product of its apothem and perimeter.
Σελίδα 44 - Two triangles are equal if the three sides of the one are equal, respectively, to the three sides of the other. In the triangles ABC and A'B'C', let AB be equal to A'B', AC to A'C', BC to B'C'. To prove that A ABC = A A'B'C'.
Σελίδα 186 - 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 diminished by twice the product of one of those sides and the projection of the other upon that side.
Σελίδα 346 - A frustum of any pyramid is equivalent to the sum of three pyramids whose common altitude is the altitude of the frustum, and whose bases are the lower base, the upper base, and a mean proportional between the bases, of the frustum. For, let ABCDE-F be a frustum of any pyramid S-ABCDE. Let S'-A'B'C' be a triangular pyramid, having the same altitude as the pyramid S-ABCDE, and a base A'B'C' equivalent to the base ABCDE, and in the same plane with it.
Σελίδα 95 - BAC, inscribed in a segment greater than a semicircle, is an acute angle ; for it is measured by half of the arc BOC, less than a semicircumference.