Drawing angles: A set square is a technical drawing instrument that is used to draw angles, such as right angles, by aligning the set square with the edge of the drawing board.
Measuring angles: A set square can also be used to measure angles by placing it against the edge of the drawing board or against another angle in the drawing
(c) With the aid of drawings, describe each of the following types of lines:
(i) outline;
(ii) _ centre line; 3
(iii) construction line. (6 marks) Oct/Nov. 2022
JemshahEnlightened
(i) Outline: An outline is a line that defines the outer edge or boundary of an object or shape. It is usually a solid, thick line that is used to distinguish the object from its surroundings. In the example, the outline of the rectangle shows the shape and size of the object.
(ii) Centre line: A centre line is a line that is used to divide an object or shape into equal halves, either horizontally or vertically. It is usually a dashed line that is used to help align and position other elements in the drawing. In the example, the center line of the rectangle is used to divide the rectangle into two equal parts.
(iii) Construction line: A construction line is a temporary line that is used to help construct and align elements in a drawing. It is usually a thin, dashed line that is used to help establish proportions, angles, and positions. In the example, the construction lines are used to draw the rectangle and to align the centerline. These lines are not necessary for the final drawing but are used as a guide to achieve the final outcome.