| Now
you know how to construct perpendicular and parallel lines, so it
is not instructive to keep doing  it again and again. From now on,
the perpendicular line  and parallel line  tools will be provided for you to use. | 
| 
 Hint: Think of a parallelogram. Of course, you can create parallel sides using the parallel line tool. 
 The solution is here. C.a.R. provides a "Circle from 3 points" tool  |