Scientific and practical geometry for self-instruction1879 |
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Σελίδα vi
... consequently turned to French works , and found those works easy , interesting , and useful . A most important character in French works is , that whilst rudimentary points are never neglected , the several works treat the study from a ...
... consequently turned to French works , and found those works easy , interesting , and useful . A most important character in French works is , that whilst rudimentary points are never neglected , the several works treat the study from a ...
Σελίδα 15
... consequently they must at length meet ; and further , by a simple proportion the exact length of the distance to which each line must be continued from its point of intersection with the line AB may be calcu- lated . Thus for line EF ...
... consequently they must at length meet ; and further , by a simple proportion the exact length of the distance to which each line must be continued from its point of intersection with the line AB may be calcu- lated . Thus for line EF ...
Σελίδα 17
... consequently more simple tools will be amply sufficient . 3. For geometrical drawing , a pair of compasses , with pen and pencil points , and a smaller pair for minute circles , a straight - edge or ruler and ruling pen or ordi- nary ...
... consequently more simple tools will be amply sufficient . 3. For geometrical drawing , a pair of compasses , with pen and pencil points , and a smaller pair for minute circles , a straight - edge or ruler and ruling pen or ordi- nary ...
Σελίδα 18
... consequently giving angles of 60 and 30 degrees . 7. A large parallel ruler is useful for drawing long lines , but is seldom required in mere geometrical work , though very useful in navigation , and in general the set squares are more ...
... consequently giving angles of 60 and 30 degrees . 7. A large parallel ruler is useful for drawing long lines , but is seldom required in mere geometrical work , though very useful in navigation , and in general the set squares are more ...
Σελίδα 34
... consequently be equal in area . 37. TO CONVERT a Triangle into an Equivalent Triangle with different Angles or different Base or Altitude . As shown in Div . C , Sect . 17 , & c . , triangles having the same base and between equidistant ...
... consequently be equal in area . 37. TO CONVERT a Triangle into an Equivalent Triangle with different Angles or different Base or Altitude . As shown in Div . C , Sect . 17 , & c . , triangles having the same base and between equidistant ...
Συχνά εμφανιζόμενοι όροι και φράσεις
ab² abcd ac² adjacent angles altitude angles equal angles Sect Application axis bisected centre chord circle circumference consequently construction continued contour corresponding angles cutting deduction demonstration diagonal diameter distance divided division draw arc draw line draw the indefinite drawn ellipse equal angles equal bases equal Sect equal sides equidistant equivalent triangle Euclid example exterior angle external angle four right angles frustrum geometrical operations give greater hypothenuse inches included angle indefinite line isosceles triangle length Let abc let fall line ac line cd mark measure half mode Multiply number of sides oblique opposed angle parallel ruler parallelogram pendicular polygons proof proposition radii ratio rectangle reflex angle rhombus right line rule in Sect secant Sectns segment semicircle set square side ab side ac similar triangles slant height summit supplementary angles tangent third side trapezium triangle abc
Δημοφιλή αποσπάσματα
Σελίδα 14 - If a straight line meets two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Σελίδα 8 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Σελίδα 7 - A circle is a plane figure bounded by a curved line called the circumference, every point of which is equally distant from a point within called the center, Fig.
Σελίδα 96 - Any two sides of a triangle are together greater than the third side.
Σελίδα 73 - Parallelograms on the same base, and between the same parallels, are equal to one another.
Σελίδα 278 - Therefore all the interior angles of the figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Σελίδα 14 - Magnitudes which coincide with one another, that is, which exactly fill the same space, are equal to one another.
Σελίδα 266 - A sphere is a solid, bounded by a curved surface, every part of which is equally distant from a point within, called the centre.
Σελίδα 45 - From a given point without a line, to draw a perpendicular to that line. Let AB be the given line, and C the given point. From C draw any oblique line, as Cn.
Σελίδα 9 - The sign, + , which is read plus, indicates that the numbers between which it is placed are to be added ; thus, 6 + 4, means, that 4 is to be added to 6.