## A course of practical geometry for mechanics |

### From inside the book

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Page 11

... degrees ; thus , the com- plement of an arc or angle of 30 degrees , is an arc or angle which contains

... 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 ... Page 12

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**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 ... Page 17

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**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 ... Page 21

... degrees . 1. Draw a line as A B in Problem II . 2. Take

... 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 ... Page 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

... 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 ...### Other editions - View all

### Common terms and phrases

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

### Popular passages

Page 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.

Page 10 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.

Page 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...

Page 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.

Page 13 - Of four-sided figures, a SQUARE is that which has all its sides equal, and all its angles right angles.

Page 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.

Page 14 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.

Page 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.

Page 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.

Page 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.