Proof Tips I

Hi Boys,
For the first page of proofs, you should be focusing on the supplementary/complementary "double and triple plays."  Remember, if you can get two supps or two comps into a proof, you'll probably end up with congruent angles.

Example:   1.  < A comp < B
                  2.  < C comp < D      ->  4.  < B = < C
                        3.  < A = < D
The reason for statement 4 would be:  Complements of congruent angles are congruent.

Page 1 
 - all double or triple plays

Page 2
- #9 is a simple warm-up to remind you what bisectors are --- 2 step proof!

- #10 should have a reason which states If two lines are perpendicular, they intersect to form right angles.  


- #11 - Start the proof with GJ bisects <FGH.  It will line up nicer and it's OK to have a triple play written "upside down."

- #16 Remember that definitions are reversible.  The definition of bisects is this:  If a ray bisects an angle, then it divides the angle into two congruent angles.   Use that definition?  Reverse it? Both????


 Don't give up easily - THINK HARD!!!