Area Man Who Talks a Lot About Teaching Teaches His First Full Day in >10
Years
-
I have taught demo and observational classes regularly since I left
full-time teaching but yesterday was the first time I taught every class
for the day. L...
3 years ago
Answer: 7.
ReplyDeleteBy Ptolemy's theorem, |AC|*|BP| + |BC|*|AP| = |AB|*|CP|. Since |AC|=|BC|=|AB|, it follows that |BP|+|AP|=|CP|.
http://www.cut-the-knot.org/proofs/ptolemy.shtml