First Lessons in Geometry: Upon the Model of Colburn's First Lessons in ArithmeticJ. Munroe & Company, 1847 - 164 σελίδες |
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Σελίδα 14
... four , as between the abstract numbers 3 and 4 ? Is it not as easy to see that two equal straight lines will coincide , as to see that 9 times 9 are 81 ? Or , to understand the definition of a straight line , as to appreciate the local ...
... four , as between the abstract numbers 3 and 4 ? Is it not as easy to see that two equal straight lines will coincide , as to see that 9 times 9 are 81 ? Or , to understand the definition of a straight line , as to appreciate the local ...
Σελίδα 20
... four Simple Rules and perhaps Reduction . Many then feared , and some still fear , that the introduction of other studies would occasion the neglect of Spelling , and , in the words of a worthy patron of that system , of " the three R's ...
... four Simple Rules and perhaps Reduction . Many then feared , and some still fear , that the introduction of other studies would occasion the neglect of Spelling , and , in the words of a worthy patron of that system , of " the three R's ...
Σελίδα 22
... four hundred corollaries , all that had come down from Apollonius , " the Great Geometer " of antiquity . And what one boy of sixteen may write , another boy of sixteen may learn . We believe that Geometry , instead of being confined ...
... four hundred corollaries , all that had come down from Apollonius , " the Great Geometer " of antiquity . And what one boy of sixteen may write , another boy of sixteen may learn . We believe that Geometry , instead of being confined ...
Σελίδα 38
... four lines AB , BC , CD , and DA . The line AB is bounded by the two points A and B. D E A G F B H d . From the idea of extension arises that of distance ; and by combining distance and direction , we obtain that of position . The ideas ...
... four lines AB , BC , CD , and DA . The line AB is bounded by the two points A and B. D E A G F B H d . From the idea of extension arises that of distance ; and by combining distance and direction , we obtain that of position . The ideas ...
Σελίδα 50
... four angles , all equal , but with the lines of different lengths . Draw four angles , no two equal , but all formed by lines of the same length . c . ) How many angles has the surface ABCD 50 [ v . a . GEOMETRY . PART I. -
... four angles , all equal , but with the lines of different lengths . Draw four angles , no two equal , but all formed by lines of the same length . c . ) How many angles has the surface ABCD 50 [ v . a . GEOMETRY . PART I. -
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
aACB AB² aBAC ABCD AC² adjacent angles angles equal angular points base and altitude BC² bisect broken line centre contain describe arcs cutting diagonals difference dimensions direction distance divergence divided draw equal angles equally distant equiangular equiangular polygons equilateral exterior figure GEOM Geometry given angle greater hypotenuse identical triangles inches interior angles isosceles triangle Join lelogram length less line drawn magnitudes multiplied oblique obtain the square obtuse opposite angle opposite sides paral parallel parallelogram perpendicular plane polygon PROBLEM PROPOSITION quadrilateral radius rectangle RHOMBUS right angles right triangle Show solid angles straight line subtending subtract surface tABC tABD termed THEOR three angles trapezoid triangle ABC Triangles agreeing unequal vertex zoid
Δημοφιλή αποσπάσματα
Σελίδα 22 - A CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.
Σελίδα 93 - Any exterior angle of a triangle is equal to the sum of the two opposite interior angles.
Σελίδα 149 - In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.
Σελίδα 156 - Side subtending the Obtuse Angle, is Greater than the Sum of the Squares of the other two Sides, by Twice the Rectangle of the Base and the Distance of the Perpendicular from the Obtuse Angle.
Σελίδα 4 - ... Theory soon descends to guide and assist the operations of practice. To the geometrical speculations of the Greeks, we may distinctly trace whatever progress the moderns have been enabled to achieve in mechanics, navigation, and the various complicated arts of life. A refined analysis has disclosed the harmony of the celestial motions, and conducted the philosopher, through a maze of intricate phenomena, to the great laws appointed for the government of the universe.
Σελίδα 23 - Of four-sided figures, a square is that which has all its sides equal, and all its angles right angles.
Σελίδα 24 - If the product of two quantities be equal to the product of two others, two of them may be made the extremes and the other two the means of a proportion.
Σελίδα 150 - F + c' = ax(BD + DC) = axa. Ax. 2 Or b' + c'=a\ QED 318. COR. I. The square of either side about the right angle is equal to the difference of the squares of the other two sides.
Σελίδα 102 - Of all the straight lines that can be drawn to a given straight line from a given point outside it, the perpendicular is the shortest.
Σελίδα 137 - Give the table of measures of length. 6. How many square inches are there in a square foot ? How many square feet are there in a square yard ? Y2 sq.