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WEEK 5
TOPIC: CONSTRUCTION
CONTENT:
- Construction of parallel lines and perpendicular line
- Bisection of a given line segment
- Construction of angles 90 and 60 degrees
Construction
To construct a figure in geometry implies to draw it accurately. The proper use of measuring and drawing instruments such as protractor, ruler, sets square, pencil, etc will enhance accurate construction.
NOTE:
- Always make a rough sketch of what you are going to draw before starting construction questions.
- The teacher should introduce all the instrument of geometric construction to the students and students should be able to identify each and know their uses.
CONSTRUCTION OF PARALLEL LINES
Parallel lines are lines that do not meet. They always have the same distance apart and are in the same direction.
Examples
- Construct accurately a line through O so that it is parallel to line MN.
Solution
- Place one edge of the set-square along the given line (i.e. MN) as shown in the diagram below.
- Place a ruler along one of the other edges of the set square as shown in the diagram.
- Hold the ruler firmly with one hand and then slide the set -square with the second hand along the edge of the ruler until you reach point O.
- Draw the line with a sharp pencil.
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