A course of practical geometry for mechanics

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Página 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.
Página 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.
Página 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.
Página 13 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 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...
Página 17 - Parallel straight lines are such as are in the same plane, and which being produced ever so far both ways, do not meet.
Página 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.
Página 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.
Página 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.
Página 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...

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