2. Given some line segment AB, whose length you do not know, construct PQ
such that the length of 'PQ is twice that of AB.
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(i) Given AB¯¯¯¯¯¯¯ whose length is not known.
(ii) Fix the compasses pointer on A and the pencil end on B. The opening of the instrument now gives the length of AB¯¯¯¯¯¯¯.
(iii) Draw any line ′l′. Choose a point P on ′l′. Without changing the compasses setting, place the pointer on Q.
(iv) Draw an arc that cuts ′l′ at a point R.
(v) Now place the pointer on R and without changing the compasses setting, draw another arc that cuts ′l′ at a point Q.
Thus PQ¯¯¯¯¯¯¯ is the required line segment whose length is twice that of AB.
Step-by-step explanation:
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