A course of practical geometry for mechanicsSimpkin and Marshall, 1843 - 68 páginas |
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Página 14
... Decagon , ten ; an Undecagon , eleven ; and a Dodecagon , or Duodecagon , twelve sides . Others are named according to the number of their sides ; as polygons of 13 , or 14 sides , & c . 33. A Regular polygon has all its sides , and all ...
... Decagon , ten ; an Undecagon , eleven ; and a Dodecagon , or Duodecagon , twelve sides . Others are named according to the number of their sides ; as polygons of 13 , or 14 sides , & c . 33. A Regular polygon has all its sides , and all ...
Página 43
... decagon is demanded on a line 3 in . long . ANOTHER METHOD . 1. Find the angle at the centre of the polygon , ( vide Def . 35 , ) by dividing 360 ° by the number of sides , the quotient being the angle at the centre . 2. By Prob . XXXVI ...
... decagon is demanded on a line 3 in . long . ANOTHER METHOD . 1. Find the angle at the centre of the polygon , ( vide Def . 35 , ) by dividing 360 ° by the number of sides , the quotient being the angle at the centre . 2. By Prob . XXXVI ...
Página 44
... decagon in a circle . Bisect 1. Let ACBD , Prob . XLVII . , be the given circle . 2. Divide the circumference into five equal arcs . each of these arcs . Draw chords to the ten arcs thus obtained ; when these chords shall form the decagon ...
... decagon in a circle . Bisect 1. Let ACBD , Prob . XLVII . , be the given circle . 2. Divide the circumference into five equal arcs . each of these arcs . Draw chords to the ten arcs thus obtained ; when these chords shall form the decagon ...
Página 45
... decagon that can be incribed therein . PROBLEM L. To inscribe a regular dodecagon in a circle . 1. Let ACBD , Prob . XLVII . , be the given circle . 2. Draw the diameters A B and O D , at right angles to one another . 3. By Prob . XXXIV ...
... decagon that can be incribed therein . PROBLEM L. To inscribe a regular dodecagon in a circle . 1. Let ACBD , Prob . XLVII . , be the given circle . 2. Draw the diameters A B and O D , at right angles to one another . 3. By Prob . XXXIV ...
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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.