Elements of GeometryH. Holt, 1881 - 399 sider |
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Resultat 1-5 av 79
Side 2
... dot and think of it as a point . The real point would be the centre of the dot . We may also regard the sharp end of a pencil as repre- senting a point . Generation of Magnitudes by Motion . 6. A line may 2 GENERAL NOTIONS .
... dot and think of it as a point . The real point would be the centre of the dot . We may also regard the sharp end of a pencil as repre- senting a point . Generation of Magnitudes by Motion . 6. A line may 2 GENERAL NOTIONS .
Side 8
... , and cut it into eight equal parts by four lines all passing through its centre O. A circular disk of paper or pasteboard may be used to represent this surface . B D B Then let us put the pieces to- 8 GENERAL NOTIONS .
... , and cut it into eight equal parts by four lines all passing through its centre O. A circular disk of paper or pasteboard may be used to represent this surface . B D B Then let us put the pieces to- 8 GENERAL NOTIONS .
Side 10
... centre . This arc must pass through the space over which the one arm must turn in order to coincide with the other . 26. In practice , angles are measured by degrees and sub- divisions of a degree , in the following way : Let a complete ...
... centre . This arc must pass through the space over which the one arm must turn in order to coincide with the other . 26. In practice , angles are measured by degrees and sub- divisions of a degree , in the following way : Let a complete ...
Side 17
... centre of symmetry . The different motions in §§ 31 and 33 must be studied . In the former the figure is turned over so that the side at first on the paper is turned up after the motion , and each part changes places with the ...
... centre of symmetry . The different motions in §§ 31 and 33 must be studied . In the former the figure is turned over so that the side at first on the paper is turned up after the motion , and each part changes places with the ...
Side 23
... centre of symmetry ( § 34 ) . THEOREM III . 50. All straight angles and all right angles are equal to each other . To prove the first part of this proposition it is sufficient to show that any two straight angles we choose A- to take ...
... centre of symmetry ( § 34 ) . THEOREM III . 50. All straight angles and all right angles are equal to each other . To prove the first part of this proposition it is sufficient to show that any two straight angles we choose A- to take ...
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Vanlige uttrykk og setninger
ABCD adjacent angles altitude angle AOB angle arc base bisect centre chord circle circumscribed coincide Conclusion cone conical surface construction corresponding curve diagonals diameter dicular dihedral angle distance divided draw edge angle ellipse equal angles equally distant exterior angle face angles figure foci frustrum geometry given greater Hence hyperbola Hypothesis identically equal indefinitely inscribed isosceles Join length line of intersection locus magnitude meet middle point number of sides opposite angles opposite sides parabola parallel planes parallelogram parallelopiped pass perpen plane MN point of intersection polyhedral angle polyhedron prism Proof pyramid Q.E.D. Corollary Q.E.D. THEOREM quadrilateral radii radius ratio rect rectangle reflex angle regular polygon right angles Scholium segments slant height solid sphere spherical triangle square straight angle straight line surface tangent trapezoid triangles are identically vertex vertices
Populære avsnitt
Side 146 - In an obtuse-angled triangle the square on the side opposite the obtuse angle is greater than the sum of the squares on the other two sides by twice the rectangle contained by either side and the projection on it of the other side.
Side 184 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Side 44 - Every point in the bisector of an angle is equally distant from the sides of the angle...
Side 149 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Side 45 - 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.
Side 103 - A rectilineal figure is said to be described about a circle, when each side of the circumscribed figure touches the circumference of the circle. V. In like manner, a circle is said to be inscribed...
Side 235 - ten decimals are sufficient to give the circumference of the earth to the fraction of an inch, and thirty decimals would give the circumference of the whole visible universe to a quantity imperceptible with the most powerful microscope.
Side 90 - The sum of the three straight lines drawn from any point within a triangle to the three vertices, is less than the sum and greater than the half sum of the three sides of the triangle (I . 33, 66).
Side 168 - 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.
Side 196 - If four straight lines be proportionals, the rectangle contained by the extremes is equal to the rectangle contained by the means.