New Plane and Solid Geometry

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D.C. Heath & Company, 1908 - 298 σελίδες
 

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Σελίδα 168 - S' denote the areas of two © whose radii are R and R', and diameters D and D', respectively. Then, | = "* § = ££ = £• <§337> That is, the areas of two circles are to each other as the squares of their radii, or as the squares of their diameters.
Σελίδα 17 - In an isosceles triangle the angles opposite the equal sides are equal.
Σελίδα 138 - ... any two parallelograms are to each other as the products of their bases by their altitudes. PROPOSITION V. THEOREM. 403. The area of a triangle is equal to half the product of its base by its altitude.
Σελίδα 168 - Similar arcs are to each other as their radii; and similar sectors are to each other as the squares of their radii.
Σελίδα 50 - If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram.
Σελίδα 128 - In any triangle, the product of any two sides is equal to the product of the segments of the third side formed by the bisector of the opposite angle, plus the square of the bisector.
Σελίδα 265 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The...
Σελίδα 282 - A zone is a portion of the surface of a sphere included between two parallel planes.
Σελίδα 241 - Every section of a cylinder made by a plane passing through an element is a parallelogram. Given ABCD, a section of cylinder AC, made by plane through element AB.
Σελίδα 256 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.

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