Elements of Plane and Solid Geometry

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Ginn and Heath, 1877 - Geometry - 398 pages
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Page 132 - To describe an isosceles triangle having each of the angles at the base double of the third angle.
Page 140 - 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.
Page 206 - In any proportion, the product of the means is equal to the product of the extremes.
Page 40 - 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.
Page 353 - A sphere is a solid bounded by a surface all points of which are equally distant from a point within called the centre.
Page 179 - Any two rectangles are to each other as the products of their bases by their altitudes.
Page 192 - 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.
Page 150 - The areas of two triangles which have 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. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.

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