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Steps of construction are:-

1) Draw a line AB of 10.5 units

2) Extend the line BC = 1 units and AC = 11.5 units

3) Take the midpoint of AC as O =

4) Draw the semicircle from A to C with O as center.

5) Draw a line Perpendicular to AC at point C until it bisects and intersects with the semi-circle forming a new point D, ND, CD =

6) With point M as center draw an arc equal to length MD on the number AC intersecting at point E

7) Now OD = OE =