How to bisect a given arc

Question : 
Draw an arc AB of 7 cm radius and bisect it.


Answer :
Step by step construction given below

Draw an arc AB of 7 cm radius.


With A as the centre and a convenient radius, draw two arcs on both the sides of the arc AB.


With B as the centre and the same radius, draw arcs intersecting the former ones in points C and D.


Draw line CD, intersecting arc AB in point O.

Line CD bisects arc AB in point O.

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