A course of practical geometry for mechanics1846 |
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Σελίδα 8
... parallel to the base of the paper . In many good drawings , the horizon is not drawn parallel to the base , because positions are given to objects which would require more paper than could be spared to assign to the horizon its true ...
... parallel to the base of the paper . In many good drawings , the horizon is not drawn parallel to the base , because positions are given to objects which would require more paper than could be spared to assign to the horizon its true ...
Σελίδα 16
... parallel . Only two of its angles can be equal , or they may all be unequal . 63. A Trapezoid is a quadrilateral which has only one pair of its opposite sides parallel . It may have each pair of angles at the extremities of each of its ...
... parallel . Only two of its angles can be equal , or they may all be unequal . 63. A Trapezoid is a quadrilateral which has only one pair of its opposite sides parallel . It may have each pair of angles at the extremities of each of its ...
Σελίδα 17
... parallel , when in the same plane , and kept at a given radiating distance throughout . 65. Parallel Planes are such as are at any given perpendicular distance throughout . The polished surfaces of perfect plate glass are parallel ...
... parallel , when in the same plane , and kept at a given radiating distance throughout . 65. Parallel Planes are such as are at any given perpendicular distance throughout . The polished surfaces of perfect plate glass are parallel ...
Σελίδα 19
... parallel , they are eccentric circles . 84. Equal plane figures are those whose areas are equal ; thus , a circle is equal to a polygon , if the two have equal areas . 85 . E Similar figures are such as have all the angles of the one ...
... parallel , they are eccentric circles . 84. Equal plane figures are those whose areas are equal ; thus , a circle is equal to a polygon , if the two have equal areas . 85 . E Similar figures are such as have all the angles of the one ...
Σελίδα 23
... parallel ruler : these can be dispensed with , particularly the three latter . The sector is seldom used ; and a " Triangle and Ruler , " made by a good carpenter , answer all the purposes of a parallel ruler , and are not so likely as ...
... parallel ruler : these can be dispensed with , particularly the three latter . The sector is seldom used ; and a " Triangle and Ruler , " made by a good carpenter , answer all the purposes of a parallel ruler , and are not so likely as ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
altitude angle to contain arc or angle arithmetic Arithmetical mean base called centre chords shall form circumference decagon describe a circle describe an arc describe arcs cutting describe the arc diagonals diameter dodecagon Draw a line Draw chords Draw the line ellipse equilateral triangle erect a perpendicular Euclid Euclid's Elements EXAMPLE extremities generatrix given angle given circle given figure given line given number given point given triangle inches long inscribe a regular isosceles triangle Join length Let A B line 2 inches lines A B number of degrees number of equal parallel parallel ruler parallelogram pentagon perpendicular plane point of intersection PROBLEM protractor radii radius ratio rectangle regular heptagon regular pentagon regular polygon rhombus right angles right-angled triangle scale scalene triangle sector segment square equal straight line Superficies tangent triangle ACB triangle required vertex vertical angle Vide Def Vide Prob WANOSTROCHT'S
Δημοφιλή αποσπάσματα
Σελίδα 11 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Σελίδα 10 - A plane rectilineal angle is the inclination of two straight lines to one another, -which meet together, but are not in the same straight line.
Σελίδα 12 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Σελίδα 13 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Σελίδα 10 - When several angles are at one point B, any one ' of them is expressed by three letters, of which the letter ' that is at the vertex of the angle, that is, at the point in ' which the straight lines that contain the angle meet one ' another, is put between the other two letters, and one of ' these two is somewhere upon one of those straight lines, ' and the other upon the other line : thus the angle which ' is contained by the straight lines AB, CB, is named the ' angle ABC, or CBA; that which is...
Σελίδα 17 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.
Σελίδα 16 - A rhomboid is that which has its opposite sides equal to one another, but all its sides are not equal, nor its angles right angles.
Σελίδα 10 - A plane angle is the inclination of two lines to one another in a plane, which meet together, but are not in the same direction.
Σελίδα 16 - A Parallelogram is a four-sided figure, of which the opposite sides are parallel ; and the diameter is the straight line joining two of its opposite angles.
Σελίδα 13 - A Segment is any part of a circle bounded by an arc and its chord. 51. A Semicircle is half the circle, or a segment cut off by a diameter. The half circumference is sometimes called the Semicircle. 52. A...