Scientific and practical geometry for self-instruction1879 |
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Σελίδα xii
... rules , in Euclid , a simple and clear rule under which angles generally may be measured ( see p . 143 , & c . , 2 E ) . Instruc- tions for measurement of " Reflex " angles , or those exceed- ing half a circle , are also given . Any ...
... rules , in Euclid , a simple and clear rule under which angles generally may be measured ( see p . 143 , & c . , 2 E ) . Instruc- tions for measurement of " Reflex " angles , or those exceed- ing half a circle , are also given . Any ...
Σελίδα 4
... rule will in all positions when placed on it coincide ; and curved where such right line will only in part coincide , as in the case of a globe or sphere . Plane surfaces may be bounded either by right lines or curved lines ; by the ...
... rule will in all positions when placed on it coincide ; and curved where such right line will only in part coincide , as in the case of a globe or sphere . Plane surfaces may be bounded either by right lines or curved lines ; by the ...
Σελίδα 20
... rule to the marking perpendiculars on planks or boards , or by using string or small cord , to the drawing perpendiculars for field work or in military operations . The following as well as other practical modes of drawing ...
... rule to the marking perpendiculars on planks or boards , or by using string or small cord , to the drawing perpendiculars for field work or in military operations . The following as well as other practical modes of drawing ...
Σελίδα 25
... rule forms part of the general rule in Sect . 18 post for the dividing a line into any number of equal or proportional parts ; but as the bisection of a line is so often required in geometrical operations , it is thought better to give ...
... rule forms part of the general rule in Sect . 18 post for the dividing a line into any number of equal or proportional parts ; but as the bisection of a line is so often required in geometrical operations , it is thought better to give ...
Σελίδα 26
... rule and examples see Div . F , Sect . 12 . For the division of lines into any parts or proportions very rapidly by an equilateral triangle , see F , Sect . 27 . 19. TO DRAW a line which will be a THIRD PROPORTIONAL to any two given ...
... rule and examples see Div . F , Sect . 12 . For the division of lines into any parts or proportions very rapidly by an equilateral triangle , see F , Sect . 27 . 19. TO DRAW a line which will be a THIRD PROPORTIONAL to any two given ...
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.