A course of practical geometry for mechanicsSimpkin and Marshall, 1843 - 68 páginas |
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Página 11
... degrees ; thus , the com- plement of an arc or angle of 30 degrees , is an arc or angle which contains 60 degrees ; 20 degrees are the complement of 70 degrees , and so on , 22. The supplement of an arc or angle is the difference ...
... degrees ; thus , the com- plement of an arc or angle of 30 degrees , is an arc or angle which contains 60 degrees ; 20 degrees are the complement of 70 degrees , and so on , 22. The supplement of an arc or angle is the difference ...
Página 12
... 60 degrees . The three angles of any triangle , are together equal to two right angles or 180 degrees . XXV . An isosceles triangle is that which has only two sides equal . A Two of its angles are equal , namely , those opposite to the ...
... 60 degrees . The three angles of any triangle , are together equal to two right angles or 180 degrees . XXV . An isosceles triangle is that which has only two sides equal . A Two of its angles are equal , namely , those opposite to the ...
Página 17
... 60. To Produce or Prolong a straight line is to lengthen it in the same straight line . 61. A Generatrix is that by ... degree is divided into sixty equal parts , called minutes ; these into sixty equal parts , called seconds ; and these ...
... 60. To Produce or Prolong a straight line is to lengthen it in the same straight line . 61. A Generatrix is that by ... degree is divided into sixty equal parts , called minutes ; these into sixty equal parts , called seconds ; and these ...
Página 21
... degrees . 1. Draw a line as A B in Problem II . 2. Take 60 degrees in the compasses , from any line or scale of chords ( marked CHO or C ) on an ivory scale , and from A as a centre , describe the arc G F. 3. Take the number of degrees ...
... degrees . 1. Draw a line as A B in Problem II . 2. Take 60 degrees in the compasses , from any line or scale of chords ( marked CHO or C ) on an ivory scale , and from A as a centre , describe the arc G F. 3. Take the number of degrees ...
Página 22
... degrees added . For example , if the angle is to contain 170 degrees , 90 degrees must first be applied on the arc , and then 80 degrees more ; each quantity to be taken from the same line of chords as the 60 degrees were , with which ...
... degrees added . For example , if the angle is to contain 170 degrees , 90 degrees must first be applied on the arc , and then 80 degrees more ; each quantity to be taken from the same line of chords as the 60 degrees were , with which ...
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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.