An Elementary Geometry |
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Page 15
... coincide with its equal BC , then CD will be in the same straight line with AC ( 10 ) . An isosceles triangle ABD is thus formed , and BC being perpendicular to the base divides the triangle into the two equal triangles ABC and BCD ( 43 ) ...
... coincide with its equal BC , then CD will be in the same straight line with AC ( 10 ) . An isosceles triangle ABD is thus formed , and BC being perpendicular to the base divides the triangle into the two equal triangles ABC and BCD ( 43 ) ...
Page 32
... coincide with the polygon GHIKLM , and therefore be equal to it . THEOREM II . 7. The area of a rectangle is equal to the product of its base and altitude . Let ABCD be a rectangle ; its area = AD × AB . BOPQRC G V F M S L AHIJK D ...
... coincide with the polygon GHIKLM , and therefore be equal to it . THEOREM II . 7. The area of a rectangle is equal to the product of its base and altitude . Let ABCD be a rectangle ; its area = AD × AB . BOPQRC G V F M S L AHIJK D ...
Page 47
... coincides with AG ; where will Fbe ? ( 7 , 11. ) D C 63. Prove that if GH , KI , and LB , in the figure above , are produced , they will meet in the same point . F L E K 64. Prove Theorem XII . , first producing FA to GH , and pro ...
... coincides with AG ; where will Fbe ? ( 7 , 11. ) D C 63. Prove that if GH , KI , and LB , in the figure above , are produced , they will meet in the same point . F L E K 64. Prove Theorem XII . , first producing FA to GH , and pro ...
Page 48
... coincide with the parts of the square on A C. 66. If A is an acute angle of the triangle ABC , and BD is the perpendicular from B to A C , then BC = AB + A C2 - 2 AC X AD 67. If A is an obtuse angle of the triangle B ABC , and BD is the ...
... coincide with the parts of the square on A C. 66. If A is an acute angle of the triangle ABC , and BD is the perpendicular from B to A C , then BC = AB + A C2 - 2 AC X AD 67. If A is an obtuse angle of the triangle B ABC , and BD is the ...
Page 50
... coincide with D , and the point C with F ; and the arc A C will coincide with DF , otherwise there would be points in the one or the other are unequally distant from the centre . Conversely . If the arcs AC and DF are equal , the ...
... coincide with D , and the point C with F ; and the arc A C will coincide with DF , otherwise there would be points in the one or the other are unequally distant from the centre . Conversely . If the arcs AC and DF are equal , the ...
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Common terms and phrases
ABC and DEF ABCD adjacent altitude angle ABC apothem base and altitude bisect centre chord circ circumference coincide cone construct the triangle convex surface Corollary cube cylinder diameter distance divided dodecagon EATON'S equal altitudes equally distant equiangular equilateral feet frustum given angle given circle given line given point given side given square given triangle half the arc hexagon homologous sides hypothenuse included angle infinite number inscribed internal angles intersection isosceles triangle Let ABCDEF line joining mean proportional measured by half number of sides opposite sides parallel planes parallelogram parallelopiped perimeter perpendicular plane parallel propositions quadrilateral radii radius ratio rectangle regular polygon respectively equal rhombus right angles right prism right pyramid right triangle Scholium secant segment similar triangles slant height sphere tangent THEOREM VIII trapezoid triangle ABC vertex
Popular passages
Page 25 - Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth.
Page 30 - If any number of quantities are proportional, any antecedent is to its consequent as the sum of all the antecedents is to the sum of all the consequents. Let a : b = c : d = e :f Now ab = ab (1) and by Theorem I.
Page 27 - If the product of two quantities is equal to the product of two others, the...
Page 43 - The area of a regular polygon is equal to half the product of its perimeter and apothem.
Page 11 - If two triangles have two sides, and the included angle of the one equal to two sides and the included angle of the other, each to each, the two triangles are equal in all respects.
Page 23 - If two triangles have two sides of one respectively equal to two sides of the other, but the third sides unequal...
Page 20 - ... polygon, is equal to twice as many right angles as the polygon has sides minus two.
Page 49 - A Circle is a plane figure bounded by a curved line every point of which is equally distant from a point within called the center.
Page 70 - A right cylinder is a solid described by the revolution of a rectangle about one of its sides.
Page 64 - DEFINITIONS. 1 . A straight line is perpendicular to a plane, when it is perpendicular to every straight line of the plane which it meets.