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Construct a 45° angle, with compass and straightedge
(For assistance see www.mathopenref.com/constangle45.html)
1. Construct a 45° angle with its vertex at the point P
2. (a) Construct a 45° angle on each end of the line below as in the example. Example

  (b) What is the precise name of the triangle that results?
  (c) What properties does this triangle have? (list 3).