Construction of a circle when its radius is known
Suppose we want to draw a circle of radius 3 cm. We need to use our compasses. Here are the steps to follow.                             
Step 1   Open the compasses for the required radius of 3 cm.
Step 2   Mark a point with a sharp pencil where we want the centre of the circle to be. Name it as O.
Step 3   Place the pointer of the compasses on O.
Step 4  Turn the compasses slowly to draw the circle. Be careful to complete the movement around in one instant.


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