Alice is designing a book shelf. LQ is the base of the book shelf. Alice wants to construct a line to represent a rack passing through R and parallel to side LQ. She uses a straight edge and compass to complete some steps of the construction. The next step in constructing the rack parallel to LQ is placing its compass at S and adjusting its width to the point P.
The remaining steps to complete construction are as follows.
The next step for Alice is to place the compass at S and adjust its width to point P.
Then, without changing the width, place the compass at point T and draw an arc by cutting the previous arc. The new point is said to be U.
With the help of straightedge, join the points U and R.
The required line is RU, that passes through R and parallel to LQ.
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