A compass is an instrument used to draw circles or the parts of circles called arcs. It consists of two movable arms hinged together where one arm has a pointed end and the other arm holds a pencil.
Note that a compass is also called a pair of compasses.
To draw a circle (or arc) with a compass:
1. Make sure that the hinge at the top of the compass is tightened so that it does not slip
2.Tighten the hold for the pencil so it also does not slip
3.Align the pencil lead with the compass's needle
4.Press down the needle and turn the knob at the top of the compass to draw a circle (or arc)
Example
Use a compass to draw a circle of radius 4 cm.
Solution:
Step 1: Use a ruler to set the distance from the point of the compass to the pencil's lead at 4 cm.Step 2: Place the point of the compass at the centre of the circle.Step 3: Draw the circle by turning the compass through 360º.
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