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Construct a line perpendicular to a line that passes through a point, with compass and straightedge
(For assistance see www.mathopenref.com/constperpextpoint.html)
1. Construct a line perpendicular to the one below that passes through the point P
2. (a) Construct a line perpendicular to AB through P, and another line perpendicular to CD also through P
  (b) What is the name of the resulting 4-sided shape? Measure its side lengths with a ruler and calculate its area.
(C) Copyright John Page 2007