Basic Constructions: Lines and Angles

Technical Drawing Applications · Chapter 5 · 5. Geometrical constructions

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Terms relating to points, lines and angles used in construction
Bisecting a line; perpendicular to a line from a point on, above or beyond the end of the line
Parallel lines through a given point and at a given distance, using set squares or compasses
Dividing a line into equal or proportional parts; a point equidistant from two points; two lines from two points meeting a given line at equal angles
Bisecting an angle; trisecting a right angle or straight angle; copying an angle; finding the centre of an arc
Constructing angles of 90, 60, 45, 30, 120, 135, 105, 75, 67.5, 52.5, 37.5 and 22.5 degrees