Exercises 2.16
1. prove theorem 13 using the following
drawing and outline:
given: aabc, bc > ca, cd bisector of
2c, and ce = ca
prove: la (= zr) > zb.
this proof may be used instead of the
one given in the text.

the first a is supposed to be a triangle symbol and the question is how do i get started after i do the given