Plane and Solid Geometry: To which is Added Plane and Spherical Trigonometry and Mensuration. Accompanied with All the Necessary Logarithmic and Trigonometric Tables |
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Page 4
... units of a surface . In short , the volume or the extension of space is the magnitude of this space , estimated or measured in units of space . GEOMETRY is the science which treats of these two princi- pal objects : The properties of ...
... units of a surface . In short , the volume or the extension of space is the magnitude of this space , estimated or measured in units of space . GEOMETRY is the science which treats of these two princi- pal objects : The properties of ...
Page 7
... unit angle . The right angle is generally the angle chosen as the unit angle . THE RULER AND THE COMPASS . 9. The straight line and the circumference of the circle , which are the only lines treated of in Elementary Geometry , are ...
... unit angle . The right angle is generally the angle chosen as the unit angle . THE RULER AND THE COMPASS . 9. The straight line and the circumference of the circle , which are the only lines treated of in Elementary Geometry , are ...
Page 48
... sometimes regard the right angle as the unit angle , so that acute angles would all be less than 1 , and obtuse angles would exceed 1 and be less than 2 . THEOREM X. An inscribed angle is measured by half the 48 GEOMETRY .
... sometimes regard the right angle as the unit angle , so that acute angles would all be less than 1 , and obtuse angles would exceed 1 and be less than 2 . THEOREM X. An inscribed angle is measured by half the 48 GEOMETRY .
Page 70
... unit , GD will be 2 , and FB = FH + HB = GD + HB = 3 ; CD = CG + GD = FB + GD = 3 + 2 = 5 ; AB = AF + FB = 2 CD + FB = 10 + 3 = 13 . Therefore the line AB is to the line CD as 13 to 5 . If AB is taken for the unit , CD will be ; but if ...
... unit , GD will be 2 , and FB = FH + HB = GD + HB = 3 ; CD = CG + GD = FB + GD = 3 + 2 = 5 ; AB = AF + FB = 2 CD + FB = 10 + 3 = 13 . Therefore the line AB is to the line CD as 13 to 5 . If AB is taken for the unit , CD will be ; but if ...
Page 73
... unit surface . We readily see that figures of very different forms may have the same superficial extent . When we wish to express the property that two surfaces have the same area , without , however , being equal , or capable of ...
... unit surface . We readily see that figures of very different forms may have the same superficial extent . When we wish to express the property that two surfaces have the same area , without , however , being equal , or capable of ...
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Common terms and phrases
a+b+c altitude apothem bisect centre chord circumference circumscribed cone consequently corresponding cosec Cosine Cotang cube cubic cylinder decimal denote diameter dicular divided draw drawn equation equivalent exterior angles feet figure frustum Geom give greater half hence hypotenuse inches intersection logarithm measure multiplied number of sides opposite parallel parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedral angle polyedron prism PROBLEM proportion pyramid quadrant radii radius ratio rectangle regular inscribed regular polygon respectively equal right angles right-angled triangle Scholium secant sector similar similar triangles Sine slant height solid solve the triangle sphere spherical triangle square straight line subtract suppose surface Tang tangent THEOREM three sides triangle ABC triangular prism volume ΙΟ
Popular passages
Page 35 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Page 80 - 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'.
Page 139 - If a straight line is perpendicular to each of two straight lines at their point of intersection, it is perpendicular to the plane of those lines.
Page 17 - The sum of all the angles of a polygon is equal to twice as many right angles as the polygon has sides, less two.
Page 176 - The radius of a sphere is a straight line, drawn from the centre to any point of the...
Page 182 - Every section of a sphere, made by a plane, is a circle.
Page 28 - If two triangles have two sides of the one equal respectively to two sides of the other, but the included angle of the first greater than the included angle of the second, then the third side of the first is greater than the third side of the second. Given A ABC and A'B'C ' with Proof STATEMENTS Apply A A'B'C ' to A ABC so that A'B
Page 165 - ... bases simply : hence two prisms of the same altitude are to each other as their bases. For a like reason, two prisms of the same base are to each other as their altitudes.
Page 29 - ... to two sides of the other, but the third side of the first greater than the third side of the second, the angle opposite the third side of the first is.
Page 13 - If equals be added to unequals, the wholes are unequal. V. If equals be taken from unequals, the remainders are unequal. VI. Things which are double of the same, are equal to one another.