what is the missing reason for the 2nd step in the proof below?
given: adi cd
prove: the slope of ad equals
the negative reciprocal
of the slope of cd.
.
statement
1. ad 1 cd
reason
given
given
2. the slope of ab is -1
the slope of cd is
3. aabd - adbc
the altitude to the hypotenuse forms
similar right triangles.
corresponding sides in similar
triangles are proportional.
5. the negative reciprocal
of cd's slope is
definition of negative reciprocal
6. the slope of ab equals the negative
reciprocal of the slope of cd.
substitution