A course of practical geometry for mechanicsSimpkin and Marshall, 1843 - 68 páginas |
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Página 6
... Vertical , or Oblique . 3. A Horizontal line is level : it takes its name from the Horizon , which is the most distant edge of the sea , as seen on a clear calm day . The true Horizon partakes of the con- vex form of the earth , and in ...
... Vertical , or Oblique . 3. A Horizontal line is level : it takes its name from the Horizon , which is the most distant edge of the sea , as seen on a clear calm day . The true Horizon partakes of the con- vex form of the earth , and in ...
Página 7
... vertical line , since the weight will , ( by the attraction of gravitation , ) inva- riably tend towards the centre of the earth . 5. An Oblique line , is any straight line which is neither vertical nor horizontal . In pure geometry ...
... vertical line , since the weight will , ( by the attraction of gravitation , ) inva- riably tend towards the centre of the earth . 5. An Oblique line , is any straight line which is neither vertical nor horizontal . In pure geometry ...
Página 8
... Vertical , or an Inclined plane . 9. A Concave superficies is that which is curvilineally hollowed . 66 10. A Convex superficies is that which is globular . Angles are either Plane or Spherical . VIII . " A Plane Angle is the ...
... Vertical , or an Inclined plane . 9. A Concave superficies is that which is curvilineally hollowed . 66 10. A Convex superficies is that which is globular . Angles are either Plane or Spherical . VIII . " A Plane Angle is the ...
Página 9
... vertical , or plumb line , which it need not be . XI . An obtuse angle is that which is greater than a right angle . XII . An acute angle is that which is less than a right angle . The length of the legs of a rectilineal angle does not ...
... vertical , or plumb line , which it need not be . XI . An obtuse angle is that which is greater than a right angle . XII . An acute angle is that which is less than a right angle . The length of the legs of a rectilineal angle does not ...
Página 15
... Vertical angles ; but if a line be drawn upon , and any where between the extremities of another line , the angles thus made are called Adjacent angles . Vide Def . X. 45. Concentric figures are such as have the same centre . 46 ...
... Vertical angles ; but if a line be drawn upon , and any where between the extremities of another line , the angles thus made are called Adjacent angles . Vide Def . X. 45. Concentric figures are such as have the same centre . 46 ...
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Términos y frases comunes
60 degrees altitude angle equal arc or angle Bisect called centre chords shall form circumference curvilineal cutting A B decagon describe a circle describe a regular describe an arc describe arcs cutting diagonals diameter dodecagon Draw a line Draw chords draw lines Draw the line ellipse equilateral triangle Euclid Euclid's Elements EXAMPLE generatrix geometry given angle given circle given line given point given right line given triangle gonals heptagon inches long inscribe isosceles triangle Join length Let A B line 2 inches line A B line parallel LVIII number of degrees number of equal parallel ruler parallelogram pentagon perpendicular plane point of intersection protractor radii radius ratio rectangle regular nonagon regular polygon rhombus right angles right-angled triangle segment square equal straight line superficies tangent trapezium triangle being given triangle equal triangle required vertex vertical angle Vide Def vide Prob
Pasajes populares
Página 8 - 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.
Página 10 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 9 - CHG; and they are adjacent angles; but when a straight line standing on another straight line makes the adjacent angles equal to one another...
Página 9 - 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.
Página 13 - Of four-sided figures, a SQUARE is that which has all its sides equal, and all its angles right angles.
Página 9 - 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.
Página 14 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.
Página 8 - 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.
Página 13 - 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.
Página 8 - DBC, or CBD ; but, if there be only one angle at a point, it may be expressed by a letter placed at that point ; as the angle at E.